I have some from Gap and JCPenney but they are too blue and light, and getting lighter with each wash. I want the really dark ones.

American Eagle baby skinny, straight leg or boot cut

Aeropostale has them for really cheap &high quality. They are sometimes $14 American Eagle is also really comfortable You can also try Hollister Or Abercrombie BUT IN MY OPINION, Aeropostale is the best price for the best quality. You can search around for more options though. Hope I helped! :)