Amazon offers Prime members the Hori Retro Mario GamePad Protector and Stylus Set for Nintendo Wii U for $4.72 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $4.98.) That's $4 under our mention from January, a current low by $4, and the best price we've seen. This case protects both the front and back of the controller while allowing access to all functions, even while charging.