A couple of years ago, I asked the group what sites you like to use for buying. I found quite a few great sites that I hadn't heard of before. This time around, I'd like to find some diamonds in the rough for places to sell or trade. Clearly, TCDB would be at the top of the list ;)
I know (and in most cases have used) the following:
COMC (lots of pros, lots of cons)
eBay (first major place to sell your collection)
sportlots (have to pay attention to the alerts when someone buys)
craigslist / facebook marketplace (local buyers only, but super easy)
beckett marketplace (I haven't used it, what's required?)
What am I missing that I should know about? Thanks all!