Yeah, those seem a bit out of whack. I'm not much of a buyer (don't have the room) but I keep an eye on eBay and you can definitely do better in terms of deals. I'm sure eventually, when working examples become scarce enough, prices will go up. Example: I used to have this Casio racing game watch as a kid that cost about £20 back in the 80s. Last year I fancied the idea of getting hold of one again only to find they were going for about £200 on eBay. Jaw hit floor, and I decided against it. It's gonna happen with consoles too, so perhaps now is a good time to buy, but we're not there yet.