From his (now deleted) bartertown post, it sounds like he has a local game store that's still selling this stuff at retail. He's probably posting it on ebay as he buys it up.
You know, on one hand, it's sad that he's ebaying them, but if he hadn't, they'd be gathering dust in some game store somewhere. I'm glad he's seeing some reward for hunting them down-- though honestly I'd be even happier if that game store saw some extra profits for taking a risk on carrying specialist games.