My understanding is that Discogs has mainly eaten this market. And my experience is that the same items on eBay are consistently higher priced on average (sometimes much more.)
Just a heads up to OP... Discogs is definitely a mom-and-pop endeavor in more ways than one. If one were nimble enough, I am almost certain they could not keep up with a more featureful competitor that shaved off the (many) pain points of buying/selling in their marketplace. Inventory (and want-list) management being a great example.
