Heard of it, never seen it. Try hitting up some retro VHS groups on Facebook or collector forums. I've seen people find even rarer stuff, so don't lose hope!

Hey, 'Celestial Voyagers' is a gem, no doubt. 'Nebula of Doom' is one of the good ones but 'Rocket Rangers' holds a special place for me. I've got a decent collection, might have 'Escape from Titan's Grip'. Got any other rare recordings to sweeten the pot if it ain't mint?