Actually, just got back from perusing IconUSA. Most rares start at $10 and go up from there--way up in some cases.
Most of the rares I got off of eBay I paid $5-8.00.
Guess I should keep that kind of info to myself, heh.
Thinking about buying one of the Angelfire sets off of eBay that contain 1 of each rare, 2 of each uncommon, and 4 of each common. But they're $250 a pop, so I'm not sure how economical that is compared to just buying the pieces I want, rather than getting all those worthless LG minis made for the skirmish game.