Barnes & Noble is offering new Android and iOS Nook customers a FREE $5 credit for a limited time. To get this deal, register a bn.com account and download and login to the Nook Android or iOS app by March 30, 2015, 2:59 am est. The $5 promotional credit will automatically add to your NOOK account within two days. The $5 credit must be redeemed before April 7th, 2015, 2:59 am est.