I found a couple great resource for educational DVDs. Not educational in the "reading, 'riting, 'rithmetic" sense, but along the lines for learning computer programs, traditional arts and crafts, hobbies, and a variety of "do-it-yourself" training.
The first place is SmartFlix.com. SmartFlix rents these types of DVDs. Unlike the similar sounding NetFlix, SmartFlix does not charge a monthly subscription. You pay $9.99 to rent a DVD for a week, which include shipping (to and from). This is a great way to check out DVDs before buying them (which can be expensive).
The next place to check out is LearningByDVD.com. LearningByDVD was recommended to me by the SmartFlix folks. They sell a huge range of DVDs, like the ones you can rent from SmartFlix. I bought a half-dozen from them already and find the customer service to be outstanding. They even ordered some DVDs they don't normally stock to fill my order. If you don't see something in their inventory, make sure you ask!