Office Depot and OfficeMax offers a $100 credit towards the purchase of a new PC of $399.99 or more for free when you trade in an eligible laptop, via the steps below. Your used item must have Window 7 or Mac OSX 10.0 or above, power on, and have its original battery and power cord. To get this deal:
  1. Purchase a qualifying PC regularly priced $399.99 or more
  2. click here, then click "Trade-In Online", and "Start Trade-In"
  3. complete the form to receive a pre-paid shipping trade-in box
  4. once your trade-in is accepted, you'll receive a $100 mail-in rebate for free
Of note, you can also trade in your eligible laptop in Office Depot and Office Max stores to receive the $100 credit on a qualifying PC purchase.