(UPDATED) Bionic Commando now $20 at Gamestop
The price was dropped today by $40 for both the PS3 and 360 versions of the game. Apparently the game is simply not selling. Might be a good deal if you're a fan of the franchise.
Originally the price drop was in-store only, but it's now reflected on the Gamestop website (even though the used versions are still listed at $50).
UPDATE: Apparently this is part of a Gamestop summer sale. Some other titles that are dropping to $20 until early August include Tom Clancy's Endwar (360/PSP), Wheelman (PS3/360), Tom Clancy's H.A.W.X. (PS3/360), and Shaun White Snowboarding (PS3/360).
Here's the link: http://www.gamestop.com/browse/ProductMerch.aspx?groupid=531