Daily bargain site Catch Of The Day normally sells a single item for 24 hours, but occasionally it runs 30 minute sales with serious bargains, such as a Wii for $199. The next such sale kicks in on Wednesday.
Prior experience suggests that these sales can be something of a virtual bunfight, and that there'll only be a handful of the most popular items, but it might be worth the battle if you spot something you like. You need to be registered with the site prior to the sale starting on Wednesday, 23 September at 12pm. If you do score a bargain, share your victory in the comment.