Best Buy offers the Alien Quadrilogy on Blu-ray for $16.99 with free shipping. That's the lowest total price we could find by $9. This set includes remastered versions of Alien, Aliens, Alien 3, and Alien Resurrection.
If you need it before Christmas, place your order by December 24 at 4 pm local time for same-day pickup. (Stores close at 6 pm.)