Your best bet for that would definitely be ebay, since those were never put out on DVD, and the VHS/Laserdisc versions of those films are long out of print. However, since it is illegal to sell such items on ebay, and people have gotten their accounts suspended for it, you might want to look elsewhere, usually any kind of local comic show has one or two of those guys selling bootleg stuff like that. Of course, be prepared to shell out $25 - $30 each for those flicks on DVD. At least, that's what I've seen them going for at the shows.