Your UMD collection can grow like a cancerous universe-creating monster at the prices that Gamestop is selling them at. Akira, Appleseed, Ghost in the Shell, and Ninja Scroll UMDs are all available at the low price of $5. (For the non-anime fans out there, Dawn of the Dead should fit the bill quite nicely.) Don't forget to use coupon code SAVER for free shipping.
[Update 1: All products are sold out! You see what happens when you price UMDs the right way?]