A lot of systems have gone from "nobody wants this" to "precious treasure" in the last decade.

That said, if you want a reasonably-priced Saturn, I recommend looking at Yahoo Japn Auctions. Japanese Saturns are still extremely common so if you put together a large YAJ order using a proxy service like Zenmarket or Dejapan, you can still get one (and an assortment of games and accessories) for a good price.

One of the major problems is that the disc drives have been failing. If you want to go the ODE route (Fenrir/MODE/etc), it's pretty easy to get your hands on a Saturn (from any region) that can't read discs but otherwise powers on and lets you access the internal menu system.