For Princeton Record Exchange try http://www.princetonrecordexchange.com/
The thing is, if you want something in particular, I would suggest GEMM and a great deal of patience. The gradings are nowhere's near being equal from merchant to merchant and the shipping has gotten ridiculous but still its viable. Near mint can mean anything from near mint to only a few major scratches.
Princeton Record Exchange is a way to kill hours and be transported away. I just absolutely get lost in there.
There are other local vendors of used vinyl but nothing as extensive as Princeton. The campus is nearby and the art museum there has some treats worth seeing as well.
I also buy occassional new records but lots of people, like vendors at work etc. know I'm into vinyl and send me presents which is often very cool and sometimes when I forget to listen to it can be an embarassment.