Okay, there are two ways around this. To my understanding, there are some Studio Pressed DVDs of a few episodes. You could try Amazon.com and search their DVDs section of the store.
Then there's the "Pirate" way. The Pirate way consists of eBay Searches and finding a home-made boxed set of all the episodes. However, these vary in audio and visual quality. It depends on how many DVDs the set may have.
If you're looking at one DVD: These usually are recorded from compressed video files. Usually V-CD format, which was transferred to DVD.
If you're looking at two or more DVDs: Your chances at are that the quality might be a little better, possibly recorded from a Home Video Release or a VHS copy someone had, which had a few episodes recorded from a Television broadcast.
Sometimes, it's best to get a factory release than a home-made copy.