I like this unit, I've been using it for 20+ years. I also bought it when Gresco used to sell the cabinet.
It works by suction, and not pressure, so the cover doesn't even need to be screwed on.
When needed, I just shake the bottle to re-settle the sand. If you can, get a cabinet where you can
replace the glass yourself to save some money there. I buy a sheet of Lexan and with a saber saw cut
out new windows. Depending on the blaster windows size and the sheet of Lexan, I can get about 6-8 replacements.
So if you can find a basic cabinet, you may be able to build your own cheaper. Something without gloves and just rubber gaskets in the hand openings.