Amazon offers Prime members Escape From Planet Earth on 3D Blu-ray / Blu-ray / DVD for $4.75 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping adds $4.98.) That's tied with last week's mention as the lowest total price we've seen. (It's also a current low by $4.) It includes digital and Ultraviolet copies of the film.

Of note, this item may take up to three weeks to ship.