Worked for exactly 30% of the $333.33 BIN price last night. Here's the message I received from eBay:

Hi Norm,

You're eligible for US $100.00 cashback.

To get your money,

1) You must click the Get cashback button on the right to create or access your Microsoft cashback account.
2) Your Microsoft cashback will then be available in your PayPal account in approximately 60 days, subject to conditions.

We appreciate your business!

Thank you,
eBay