Head over to Walmart for a great deal on a collection of four batman movies. Right now, you can get a four film collection on DVD for $9.96 or a four film collection on Blu-Ray for $12.96. You can also save on shipping when you opt for free in-store pickup. Each of these collections includes Batman, Batman Returns, Batman Forever, and Batman & Robin.
Amazon also has this collection for $12.96, if you prefer.