Look for early appearances of Sam Raimi and Joel Coen as guards in Spies Like Us. As for the movie, it has a few decent moments, but it's nothing spectacular.
Night of the Comet is great. Another so-bad-it's-good Kelly Maroney film is Chopping Mall (aka Killbots).
The Ninja trilogy (Enter, Return, and Domination) isn't on DVD, but can be found other ways. (Matter of fact, Enter the Ninja is on Hulu)