Transformers: War for Cybertron doled out three exclusive codes with preorders through three different retailers - unlocking Jazz, Shockwave or Demolisher for play. Some people must have confused "exclusive" with "rare," as eBay bids on these codes have touched $100.
Demolisher (pictured), unlocked with the Amazon preorder, got a bid as high as $105 in an auction ending Monday, according to GamesRadar. (Not coincidentally, a code put up for sale since GR's post has an asking price of $125. And zero bids.) Currently he's getting bids between $29.99 and $70.
That's still a hell of a lot of money for something that could, in six months' time, end up as a freebie or a 400 point download. But if you really have to Buy It Now!!! knock yourself out ...