I'd need to know the style first...are you going for t-shirts, jeans, oddball stuff, fanboy stuff, a mishmash of the above, or what? Cuz if that's the case, we might want to try a few large thrift stores first (I know of three off the top of my head) and then hit up 'actual' stores afterwards. You find things at thrift stores that you'd either never find otherwise or they'd cost a fortune.