Legally? No one can legally sell copies of a copyrighted television program except the holder of the copyright. There are likely people out on the web who will offer up homemade DVDs, but since you would be dealing with someone not interested in legalities, you might end up getting scammed and/or have an unhappy experience. So let the buyer beware. This is why most media-related sites (including this one) frown on "sellers" lurking around trying to peddle such pirated/bootleg materials.