I would totally buy a Microsoft Zune for $90. The normal price is $229.99. Amazon's Customer Vote promotion makes it possible.

The voting for this round closes today at 11:59 p.m. Pacific time. The 1,000 Zune player for $90 will be sold Tuesday December 12th (12:00 a.m. - 11:59 p.m. Pacific time). IMPORTANT: Amazon changed the rules. They do not want anymore to have everybody load the Amazon Customers Vote page at the same time and overload their servers. The 1,000 customers will be randomly selected on Tuesday among those who voted for the Zune. You can visit the page anytime between 12:00am and 11:59pm pacific time to see if you have been selected.

If you did not vote for the Zune, you are only having a chance to be selected for the item you have voted for and get offered a smaller rebate on that one. This is still great, as one of the item is the hard to find T.M.X. Elmo.
More details on the Amazon Customers Vote page.
The Xbox 360 core for $100 is the first Amazon Customers Vote deal a couple of weeks ago.