http://www.google.com/nexus/tap/ -if you own a Nexus 4, Nexus 5, Nexus 6, Nexus 7, Nexus 9, Nexus 5X, or Nexus 6P, use Android Pay to tap and pay to get a $20 Best Buy e-gift card.  It will be added to your Android Pay account. This promotion is valid through December 31, 2015 or while supplies last, whichever occurs first.