Also to help you guys out with this deal Best Buy is doing a Buy One Gaming Currency Card and Get The Second 20% Off deal starting Sunday. Get more, pay less!
https://www.cheapassgamer.com/topic/356782-best-buy-ad-619-625/
holy crap. Including the $15 credit, this makes it a total of 25% off PSN currency, ON TOP OF the deals. Damn. That even beats GCU and Amazon Prime on digital pre-orders.