I've never paid that much for a used CD on eBay and I don't think I only listen to popular or well-known artists...
Try the Discogs Marketplace if you haven't had any luck on eBay, sellers there tend to know a bit more about how much their stuff is worth. It's pretty nice if you're looking for a particular pressing, too.
i live in australia, and i can only find sales from europe or america (even on discogs). even without shipping, the cheapest i can find are about 3€ or something, wheres a CD-R costs about 1$AUD each. also shipping can take about 2 weeks