There's one in San Diego. I've bought some stuff there before, but it's kinda expensive seeing how everything is used. I was gonna sell some stuff there before but didn't. I had a friend who did and they didn't give her much at all.
I've sold things to them before and if I recall correctly, they pay you 33% of what they are reselling it for if you want cash and if you want store credit, it's 50%. They are quite picky though - I think the most I've ever made was $35.