Here's the poop on the live.com thing. I've found that searching for different items will yield different %s off, but if you click the link with the highest percent to get to ebay, you retain that % off no matter the item you purchase. I got an appletv at the macbook discount of 30% cashback (for example, macbooks are listed at 6%, but macbook accessories say 25% today). They may at some point figure this out and close the loop, but whilst it's still open...
1.Visit Microsoft Live Search:
www.live.com
2.In the Live Search box, enter your search for a product.
3.Click on any eligible eBay-sponsored ad. This brings you to the eBay site.
Important: Your cashback offer will be good for 60 minutes from the time you click the ad and arrive on eBay.com. You must complete a purchase on eBay of any eligible items within 60 minutes of clicking the ad. For definition of eligible items and conditions, see Terms of Use.
4.Look for your cashback rebate percentage at the top of the eBay page.
5.After you purchase an eligible item and pay for it with PayPal, go to My Messages in My eBay for an email with instructions on how to claim your cashback.
Important: You must click the Get cashback button in the email.
6.You now need to use the link in your My Messages to link a PayPal Account with your Microsoft Rebate Center Account.
Once you have linked these accounts, it may take a few days for the eBay purchase to be seen in your Microsoft Rebate Center account.
7.Microsoft will deposit your cashback redemption into your PayPal account 60 days after the eBay transaction has successfully completed including payment. Once payment is requested, it may take up to 14 days to show up in your PayPal account.