Fortnite players can get PDP’s Riffmaster Wireless Guitar Controller for a great price at Amazon, Best Buy, and Walmart. The Xbox/PC and PlayStation editions of the officially licensed controller are on sale for $110 (was $130). But heads up: Amazon sold out of the PS5 controller deal pretty fast, but Xbox and PC users can still grab the Riffmaster for $110 at Amazon. Meanwhile, Best Buy and Walmart have both edition in stock for the deal…