byoc.en is kicking off the summertime a bit early with its first-ever bring your own cup day? >> reporter: hope you're thirsty for a slurpee. this saturday, customers can fill up any cup that they bring into the store for the price of a medium slurpee. there are a few rules. you can't use a bucket or a garbage as a cup. but after that pretty much anything goes. >> i used to work at a 7- eleven. i thought i would be drinking slurpees forever and a day and after a week -- they're good though. >> my son likes the blueberry ones. his tongue gets all blue. >> thank you, jill wagner of cbsmoneywatch.com. >>> it is 5:40. a very public mistake from the u.s. postal service. yesterday it unveiled a new forever stamp featuring author maya angelou. the problem, the quote is actually from someone else. usps reps defended it saying it had been widely attributed to her. a spokesman said, had we known about this issue beforehand, we would have used one of angelou's many other works. the sentence held great