olivia stearns explains how it works. >> reporter: megan and gus buy everything online. >> household goods. we buy furniture. diapers. >> reporter: and like most new parents, they're always looking for new ways to save. >> we saved on that $2. >> reporter: their latest trick, an online service that automatically gets you money back when something you've already bought goes on sale on average within 20 days. >> we have saved $400 in about 30 purchases in about a year. >> $400? >> yeah. >> reporter: their biggest savings yet, $270 back on this $1,500 patio set. >> it was awesome. i thought it was an error on the system. >> reporter: eric lyman and kareem started paribus nine months ago. the fact that retailers such as amazon are now adjusting prices millions of times per day. >> it's surprising, you wouldn't be thinking cereal will go 40% off in a couple of days. >> reporter: here's how it works. sign up for paribus online, scan your e-mails for receipts. and track current sale prices on items you bought. when a price drops, paribus gets you the difference and keeps 25%. currently pari

i'm now joined by nbc's olivia stearns. obviously, olivia, a lot of questions.g signs of unity here, but this country is dealing with a serious issue. a lot of questions about radicalization, how of the these terrorists, homegrown right here in belgium. >> and a lot of belgians rightly frustrated that the authorities haven't really done enough. this is obviously a huge problem. belgium has the highest proportion per capita of native-born citizens who are going to syria to fight. it's a big problem. earlier today i was in molenbeek and spoke to one woman, a belgian-born woman who married a moroccan and converted, whose son went to syria to join isis and fight with isis and was killed. she formed a support group for other mothers in her situation. she said her son was always a bright, smart, friendly young guy, but when it came to finding a job in belgium, he couldn't find one. he felt he couldn't get one because he was moroccan and he never really felt at place here. >> did you try to stop him? >> we tried to stop him. i said, what can we do? i cannot close the d

just in front of the house. >> and olivia stearns joins us now.azing you asked her, do you know where the mother lives and she points to the apartment possess. >> oh, she lives in the apartment and one of his brothers works in a local government. this is the family the community knows well that's why i pushed her to say don't you know that some people knew she was here and she said she doesn't think he was actually under her nose for the past four months. incredible but yes she said she was frustrated or people are frustrated they feel they are painted as a hot bed of fundamentalism. some people recented bewere there with video cameras but the truth is she is given a lives 80 people with suspected ties to terrorism and there is little she can do about it because of the way the government here is structureed. that's a problem for the federal police in her words she sort of felt her hands were tied. erica? >> it is just fascinating. the more we learn, the more we learn how countries do things differently. thanks is much. great interview there. our c

olivia stearns has more on our series, the price you pay. >> reporter: every fall, john wakefield goes hiking with his buddies out west. but last year his back was hurting. so he decided to get an mri before the >> i wasn't going to be caught in the woods with, you know, back issues. >> reporter: in tampa, where john lives, an mri costs on average $1,700. with his insurance deductible, john would have had to pay all of it out of pocket. but then he found an amazing deal. >> i paid $450. >> reporter: john used a new online marketplace called save on medical. >> almost like expedia for medical care. >> reporter: here's how it works. simply choose your procedure, enter your zip, and a list of providers pops up alongside ratings, reviews, and most importantly, price. matt schneider is the ceo of save on medical. >> those who come to our site want to pay for a howard johnson, but want to stay at the ritz-carlton. >> reporter: prices can vary in one neighborhood. >> the typical price in the area is $1,509. the average patient can save 69%. >> how did you get the providers to bring down the p

resulted in several people being detained over the past 24 hours, as we've heard, nbc's olivia stearnstalking to people affected by the attacks and also the terror threat, which is alive over there. olivia, what are you hearing right now, two days later? >> reporter: well, chris -- two days later, earlier today, i spoke with one american woman, katherine marsh. she is an author over here of children's books. she moved over here actually with her family this summer, with her 5-year-old daughter and her 8-year-old son, and she thought this was going to be an idyllic cultural immersion, a two-year stint, but at times it has felt like a war zone, if not a society under threat. and she said, once again, as in the u.s., she finds herself fearing for her children's safety when at school. have a listen. >> i've done things that i never i expected to have to do here in europe. when we lived in the u.s., after sandy hook, i was so distraught, as were in parents, and i did talk to my kids, especially when my son started elementary school, about what to do if there's an active shooter. and i found

nbc's olivia stearns has more on our series, the price you pay. >> reporter: every fall, john wakefield es hiking with his buddies t west. but last year his ck was hurting. soe decided to g an mri fore the trip. >> i wasn't going to be caught in the woods with, you know, back isss. >> reporter: in tampa, whe john lives, an mri sts average $1,7. with hisur dedule, hn would he ha pay alal of it ouocket. but en he found an aming . >> pai$450. >> reporter: john used a new online marketplace lled save on medical. >>lmost like expedia for mecal care. >> rorr: here's w it works. simply choe your procur enter yourip, and a st of providerpops up alonide ratings, reviews, and most imrtantly, price. ma schider is the save on medical. >> patients who come to our site, they want to pay for the howard johnson, but they want to stay at the ritz-carlton. >> reporter:e showed meow prices canary for an mri in just one nehborhood. >> the typical pce in the area is $1,509. the average patient can save 69%. how did you get the providers to bring dowthe prices? >> there doing that because they want to sell t

cal perry and olivia stearns are among our reporting team over there, starting with you, cal.r: yeah, hey, brian. i also want to point out, here in downtown brussels, things are returning to normal, life is returning to normal. this is a very busy thoroughfare and it speaks to the war of perception that isis is waging online and in reality. these photos are allegedly from a city in syria. i say allegedly, because this is isis propaganda. they say that they're celebrating the attacks that took place here. they're handing out candy. we can't verify these photos. we donate know where they're from, and it speaks again to this perception battle that is underway. you mentioned heightened security. there are a few hundred more piece on the streets. but again, here in downtown, people are going about their lives, going about the normalcy, normality is returning on the streets. if people are living in fear, they're getting used to living in fear. that's a key thing to point out. cal perry, thank you. olivia is also part of the team, looking at some of the stories that have emerged from

olivia stearns spoke with the mayor today. >> reporter: have you identified people who may be sympatheticnot of the local police. >> but you, as someone who is in charge of the area as the mayor, do you feel like you know which groups, which imams, mosques do sympathize with terrorism? >> well, we have information about what they are doing and we transfer that information to the federal, to the security. >> are they doing enough to put it a stop to it? >> well, they do what they can but, as i said, it's a new phenomenon and so we have to be better organized to fight terrorism. >> what happens next? do you think there will be another attack? >> well, i don't know. >> she doesn't know a lot of people are feeling that way this morning. olivia, we were hearing from peter spiegel that authorities feel they are playing catch-up. >> she feels like they are hands have been tied. every time i said, what did you do about this, what did you do about that? she said, it's not up to me. it's up to the federal police. it speaks to the way that the fractured organization. in the public square, it's a nor

olivia stearns, nbc news, new york. >> netflix of fashion. >> living in new york, that's my biggest problem. just send the clothes back. >> they have it for men, too. the black tux. i use it. is service like that for tuxedo, it's great. >>> we have allison williams here, talking about married >>>re fo fe s we' slartyno neaso t shwine ur,cludg, a ma quilyer tha marriage doe'tsaeqlblis kw yus m toh? 't ouil froyou i a te go in a msurd, nould cr >> are y ris, >>ye>> wano awith y tsow isms, mornin cos areta in a rela iess. . e ltthe - ihinkhe's definy g ismi shha nxas cc mriun hehe go. ets ight just which ss offtlit n. >>ye. t to tell it. >>s oth t e hto wre er i c oil.on w tis>> theou t wt t know whheilsar t theo git. it's wecis a shheret'sot avhe l intny i'itit. >>l, wched mni growse >>e cha aind she was peec inero ty. hot,sming.you, . ,y i she >>does iloikto in heamarrge? s i lk l a ti,nd we? sh us s onshe'orking with kif aninrigtner atmes. nk s's d heres tif san, but tirmi n't kn avo >> tisso fi. >> >> tilbe a seaso x. >>s. >> u grad yo th itima seas. rdw yuld. weole. gt anggh tst of gr>> h

olivia stearns, nbc news, new york. >> netflix of fashion. >> living in new york, that's my biggest problem. just send the clothes back. >> they have it for men, too. the black tux. i use it. is service like that for tuxedo, it's great. >>> we have allison williams here, talking about married life, making her first movie and first, this is "tod >>> we're back at 8:38. for five seasons we've watched the cast of "girls" make their slow march to maturity. now, next season is going to be the show's last, we're witnessing major milestones for the foursome, including, yes, a marnie quickly discovers that marriage doesn't necessarily equal marital bliss. >> do you know you just recoiled from my touch? >> i didn't. >> you recoiled from my touch like i'm a monster. >> oh, my god. >> in all the months we courted, i never dreamed you could be this cruel. >> cruel? >> yeah. >> yeah. >> i don't want to get a scone with you this morning and now i'm cruel? morning. >> morning. relationship. >> sconegate, i guess. >> yeah. so you were left at the altar -- >> we know that but she doesn't. i think she's defi

olivia stearns, nbc news, new york. >> netflix of fashion. >> living in new york, that's my biggest problem. just send the clothes back. >> they have it for men, too. i use it. is service like that for tuxedo, it's great. >>> we have allison williams here, talking about married we have to talk about "girls." hey there, heard the good news? spray 'n wash is back... and even better. it's powerful formula removes everyday stains the first time. which is bad news for stains, and good news for you. spray 'n wash. back 'n better. everyone loves how they feel in dark clothes. and to keep those darks from fading... there's woolite darks. it's free of harsh ingredients, keeping dark clothes looking like new for 30 washes so your love for dark clothes will never fade. >>> we're back at 8:38. for five seasons we've watched the cast of "girls" make their slow march to maturity. now, next season is going to be the show's last, we're the foursome, including, yes, a wedding. marnie quickly discovers that marriage doesn't necessarily equal marital bliss. >> do you know you just recoiled from my touch? >> i