As others have said, finding the local cons with local dealers can be great for deals. Attended Albany Comic Con for the first time this year, and organizers madesure the show was a place to find deals. There was a large poster at the entrance stating something along the lines of "vendors must be prepared to make deals" and this was reiterated over the PA system "we are here to buy/sell comics, make it happen". I wasn't shopping for keys so I can't speak on prices for big ticket items, but quick deals were everywhere. My wife was looking for one book out of a two book set, found both in a set, told the vendor she was only looking for #2 so he said take them both for the price of one.