S.B.
craigslist.org
I can't tell you how much stuff we have sold and bought on this site! It's almost like an online garage sale. It's free. You can request cash only. You set the price, but I would leave some room for negotiation. People contact you via the site through email, so they don't have your contact info unless you give it to them. They have to work around your schedule. We have had a lot of success with this site.