gogamer.com. Oblivion is also on sale for $35 for the PC... for those who haven't bought the game yet. I'm still going to pass because of my lowly graphics card.
You're passing on Oblivion because of your graphics card? I decided to plug in my backup graphics card, a 128mb Radeon 9500 Pro, to see how Oblivion performed on it and it really wasn't that bad. I had to stick to 800x600 resolution, but here are some screenshots with the yellow number in the corner being the frames per second: