Plus many others.
- Talkbass Marketplace
- Facebook Marketplace
- Reverb.com
- eBay.com
- MusicGoRound.com
- Mercari.com
- LetGo.com
- Close5.com
- Goodwill.com
- Craigslist.org (although these days I find CL to be generally disadvantageous)
The first four won't work as "cash here and now" for many people. They are also laden with opportunities to get scammed by a potential buyer - TB far less than others - but anything involving PreyPal is a risk nowadays.
Music Go Round will follow GC soon enough. As will Sam Ash.
Goodwill only accepts donations AFAIK, I haven't heard about them buying gear outright.
Craiglist has been a wasteland in my neck of the woods for quite some time, as has LetGo. Can't speak of Mercari/Close since I know nothing of them.
So, you need to unload that '05 American Precision for $500 *tonight* and don't have a PP account. Where do you go?