Odds are you’ve heard of Noble Knight Games by now. But if not, you owe it to yourself to give ’em a look. They’re pretty much the absolute best online RPG shop, and they have a strong focus on out of print games.
Part of how they fuel that side of their business is by taking trade-ins from nerdly folks like me. I just did a big deal with them and was treated quite fairly. Heck, they even paid for shipping on that big box o’ games I was never gonna play again.
So if there’s something you’re looking for that you can’t find anywhere else (or if you just want to order online) I highly recommend giving the folks at Noble Knight a bit of business. They’re good people who do right by their customers. Heck, you might even wind up with something I used to own.