Decide which DVDs you want. Multiple Scooby-Doo seasons, specials and feature-length movies are all available in the DVD format. By deciding which DVDs you want in advance, you can save money and time.
Look for DVDs online. Major sellers like Amazon.com and Barnes and Noble offer the DVDs, often at substantially discounted prices. By searching these major sites, you can determine what is available and what your purchase will cost you.
Shop for the DVDs in a retail store. This is an especially good plan for new releases, since bookstores and music stores often carry only recently-released DVDs. Shopping in person allows you to browse, and you will be able to take your DVDs home immediately, without waiting for shipping.
Check DVD re-sale sites. Older DVDs are often available from re-sellers at substantial discounts. Searching for the DVDs you specifically want can lead you to many of these re-sellers. Other re-seller sites are linked directly to major primary sellers, such as Amazon.
Bid for DVDs on eBay. While it is never certain that you will win an eBay auction or that you will save significant amounts of money, eBay can be a good way to get DVDs at a discount. Search for "Scooby Doo" on the site to see which auctions are now in progress.