I am located in Pennsylvania and I am trying to find somewhere that I can sell a gently used manual wheelchair. Where can I go to sell this?

Purchased for my husband and he didn't really need it that long. We would like to try to just make some of our money back as we paid over 6,000 for it. It is in practically brand new shape with a roto cushion inflatable seat cushion and lots of extras. If someone could point me in the right direction it would be greatly appreciated.