Amazon offers Prime members Teenage Mutant Ninja Turtles: Out of the Shadows on 3D Blu-ray / Blu-ray / DVD / HD Digital for $9.99 with free shipping. (Best Buy charges the same price via in-store pickup.) That's the lowest price we could find by $6.

Update: It's now out of stock at Amazon; however, Best Buy still offers it for $9.99 with in-store pickup.