Trying to sell used phones, help please?

I've looked at some historical questions. I found Envirofone very interesting and helpful to recycling, but I can't take Euros because I live in the U.S.

Are there any stores that'll take my old phone and buy it?

I'm more towards looking for a store to sell it to rather than use it online (I'm in NJ if a buissness that buys phones is common here).

I appreciate your help.