Not sure if it beats the staples deal your talking about but I would
1. Buy eBay gc at staples w/ cash back link and 5X ink.
2. Buy Best Buy gc off eBay with cash back link using eBay gc, also earns eBay bucks and 8% if you wait for eBay bucks promotion
3 Buy surface 4 at BestBuy using gc, $150 off edu coupon, 10% off movers coupon, and use cash back link.
That's triple dipping in cash back plus 5X ink and 8% eBay bucks if you time it right. I bet it ends up 50% off msrp.