Totinos is the cheapest, nastiest frozen pizza...and yet I can't stop myself from buying it and eating it. It's kind of like a McDonald's burger. It's barely recognizable as that food (especially now that they're rectangles!), but when that's what I want, nothing else will do.
Aldi briefly had a spinach, tomato, and goat cheese frozen pizza that was really, really good. But in typical Aldi fashion, it's no longer available.
This may not be what you’re looking for, but Lou malnatis deep dish is amazing. Actually cooking one as we speak. We mail order 6 at a time through tasteofchicago.com and keep them in our basement freezer.
I prefer Aldi's thin crust that is crust only and you have to add everything. Except I never use the sauce packets and make my own white sauce instead.