Best Buy offers the Disney Infinity 3.0 Marvel Battlegrounds Power Disc Pack for $1.99. Choose in-store pickup to dodge the $3.99 shipping fee. (Amazon charges Prime members the same price with free shipping.) That's the lowest price we could find by $8. The power discs included are Cosmic Cube Blast, Darkhawk’s Blast, Nova Corps Strike, and Ghost Rider’s Motorcycle.