Hi, first off I know there is a Gear Ads section but I don't think my post fits there.

I am interested in getting a new nylon string guitar that is a bit out of my price range, but nonetheless I want it . So I'm thinking about selling the two acoustic guitars I already own (1 steel-string, 1 nylon). What are good and efficient methods to selling them? Online? BTW I live in New York City if that makes a difference.