Amazon offers its Prime members Marvel's The Avengers 3D 4-Disc Combo Pack on Blu-ray / DVD for $24.96 with free shipping. (Non-members can spend $25 of more to qualify for free shipping; otherwise shipping adds $2.98.) That's the lowest total price we could find by $14, although we saw it for $5 less in September. Sales tax is added where applicable. It includes a digital copy and 3D version of the film.