If you're looking to upgrade to a new Nexus 9 tablet from Google, Best Buy is looking to sweeten the deal for you. From now until November 29, if you trade in any working tablet that may be collecting dust around the house, you'll get at least a $50 gift card for that tablet plus a $50 coupon to knock down the price of the Nexus 9. There are some restrictions to the deal, mainly that Barnes & Noble's Nook tablet and e-readers do not qualify.