Buy used DVDs at swap meets or online. Used DVDs can be significantly cheaper than new ones. Often used DVDs are just as good as new ones, but by buying them when they've been previously viewed, you can save a bundle. Swap meets or online stores such as eBay are great places to purchase used DVDs for a reasonable cost.
Trade in your old DVDs for new ones at stores and websites such as Wherehouse.com. These stores allow you to trade in your old DVDs for a DVD that you wish to purchase, and can make purchasing new or used DVDs very cheap or even free.
Purchase new DVDs several months or years after they've been released. DVDs are most expensive when they are first released for sale. If you are willing to wait several months or years after they have been released, you can save a lot of money on the new DVD.