Surface Go 8/128 $549 Select a Surface Go Keyboard $129 $678 total minus 100 = $578. or the 4/64 399 + 129 kybd + 100 for Pen at 15% you'd get 94.20 off but you could add other items to your cart. The promo applies to everything in the Cart up to $100. Use Promo code at checkout "PRONTO15" and get 15% off up to $100 add the Go and a Keyboard to your cart then checkout and apply the promo code. Links are to Antoline Ebay store but this works at other Ebay stores too (Best Buy etc.), select depending on location for tax purposes.