especially when gentlemeric dru are thought to be more inexpensive. >> i was shocked. confused. what am i missing? this isn't compute. >> reporter: she never been an activist fell compelled to try to figure this out. >> i started and my own to phone other pharmacies in the twin cities here. >> reporter: last june, she made another round of calls like she did more than a year prior. and what she found was that nothing had changed. wildly varying prices for her generic breast cancer drug. >> hi. i'm like to find out what the retrail price is for the 30-day supply of the genetic drug called letrozol. >> $11.45. >> $29.88. >> $364.99. >> ooh. i didn't realize it was that much. $435? >> $455. >> it didn't seem fair and it seems to me especially egregious, when it involved a life-saving cancer drug. it just upset me. >> reporter: her discovery wasn't just alarming for her. it was very personal for me. because carol thompson is my mom. we used her story, because what we thought might just be a fluke turned out to be part of a much larger floob fproblem that few aware of. retail prices