So I was off with the range I said, I did say that I'm new to the scene and I don't know all the prices exactly I was just guessing really - I know that there are $1000 games out there for at least some systems, along with seeing high prices on Yahoo Auctions and not knowing which are collectors items and which aren't.
All I was trying to say is that there are a lot of Pc-engine titles that are not cheap esp if you want more than one or two titles for your collection! The exact prices wasn't really the point. The point was that they are expensive enough to justify trying them out for a while to pick and choose which games to buy.
BTW - Thanks Necromancer, for answering the questions about the CD's. That really helped out a lot!