Amazon offers the Nyko Smartphone Smart Clip for PlayStation 4 for $9.99. (Fry's offers it for the same price via in-store pickup, but with availability limited by ZIP code.) Plus, Prime members receive free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, it adds $4.98.) That's the lowest total price we could find for this hard to find item by $1. It attaches your smartphone to a PlayStation DualShock 4 controller to allow for second-screen functionality via the PlayStation App.