The two American made Guyver movies from the early 90s have been re-released. Disappointingly, the US releases are DVD only, and part of the manufactured-by-demand Warner Archive line, but it's better than nothing.
http://www.animenewsnetwork.com/news/20 ... ue/.107010
If you haven't seen these movies, don't let the misleading cover of the first one fool you. Mark Hamill is in it, but he doesn't play The Guyver; he's instead in a supporting role. Neither movie is brilliant, but the second is definitely much better than the first. Point of interest: in the second movie, Dark Hero, The Guyver is played by David Hayter, better known as the voice of Solid Snake.
Somewhat better news is that the first movie is getting a blu-ray release in the UK in December. I stumbled across this while checking if the old DVDs were still available over here. No sign of a corresponding release for the second one unfortunately.
https://www.amazon.co.uk/Guyver-Blu-ray ... rds=guyver
People in the UK may remember this movie under the title Mutronics: The Movie, as the name was changed for its original VHS release.