I have to agree with Lish, it all depends where you are and sometimes when you are.
I have scored some incredible deals on PS1/DC games simply because the EBGames & Gamestops here are trying to unload them. (they also do not take them in trade anymore)
I have bought several - complete and disc only games for $1 or less.
I also picked up several DC VMU for $.99 ea.
I also got Final Fantasy Tactics & Ogre Battle (complete) for $11.00 ea. They go for a bit more on e-Bay now. That stupid supply/demand thingy.
Dreamcast systems are pretty much non-existent here. I did not know that when TheValeman convinced me I needed one.
A couple of months ago I was in Ohio and I saw lots of them in shops. I picked up my dreamcast system complete w/controller, VMU, rumble pak and all cables for $30.00, and a DC keyboard for $5.00. If I had known how hard it would be for me to get another system for that price, I would have bought 2 or 3.
I've looked on e-Bay, but I don't want another system THAT much.
Back before the professional sellers moved onto e-Bay, I used to get some really good deals there.