It’s extremely odd to me that these three films have never been collected in a box set. Different rights holders? Maybe. Except for the Mimic movies, I can’t think of a low-budget trilogy from this era that was so consistently good. Unsurprisingly, Larry Cohen wrote these. That’s a guarantee of quality right there.
Well, Tremors, but there was four of those, and I’m not sure they ever got as cheap as these and the Mimics movies did.
Also, dude, being thrifty is one thing, but it might be time to change the blades in your razor.