If you are after a Surface Book, its a really good chance to save up. Top model (1TB/i7/16GB) $4949 can save up to $673 after the 10% off and the 4% cash back currently running at cashreward. Apart from Surface, others like software can have cash back up to 8% from cashreward.
Too bad I can't post my cashreward referral here :(
MOD: Link changed from OP's screenshot back to Microsoft Store. Link to coupon page on Cashrewards. @OP — please stop changing it back & link directly to the store rather than cashback sites, unless the deal is about the cashback site.
I would wait for the Microsoft event in a few days for any surface items, likely new surface range coming, so 2015/2016 models will be discounted in the near future.