Teeth Whitening

I would like my teeth whitened without spending hundreds of dollars... I know that is probably not realistic. Does anyone know of any store-bought products or online products that really do work? I've tried Crest whitening strips and tooth paste. They work a little bit, but they hurt my teeth more than whiten. So I never end up actually using the whole box. My teeth aren't yellow, but they aren't bright. I don't want the fake white look, lol...but I want them to be a little brighter.