Canada Cup and Twitch TV is bringing a premium stream for the event this weekend. For $9 you can watch Canada Cup in HD and no ads. If you don't want to pay you can have the 360p and ads stream for free. I wonder if more streams will adopt this or not.
Amazon is assuming the PS3 version will be the most popular version so they dropped the price on the 360 version to pick up extra sales. The Limited Edition is still $80 and you also get $5 off MGS:Rising with any purchase of the game.