MST3K-TM can be found on Video Cassette and DVD, but the DVD version is extremely rare, and no new DVD's are being sold. You might find the DVD version on Ebay or Half.com, or somewhere else where used items are sold. This Island Earth can definately be found on Video Cassette. I was at a movie store that was going out of business, and I wanted to buy MST3K, but they only had This Island Earth left, which they suggested...but I declined. That program I caught on TV was called "would you believe?" on the discovery channel last night. I'm sure you could get a copy of that from their webpage, if you want it that bad (hahaha, I doubt this is the video you wanted).

i used to watch mst3k all the time. i vaguely remember them doing a movie release...and then i really don't remember if i saw it or not.