Lingerie Sale

I’m going to New York this weekend, and im planning to get some bras from rue21, cuz i saw on the website that they’re like 6.99.
However, im a little concerned about the quality, like if they’re only 6.99, is the quality bad ? decent? just okay ? i’ve only worn bras from la senza girl and aerie before..haha so im not sure about other brands.
thanks in advance !