Amazon offers the Disney Infinity Power Disc Capsule for $2.99. (GameStop charges the same via pickup.) 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 by $4. It holds up to 22 power discs and features a slide-tray, and hexagon and circle Dual Power Discs bands.