It looks like a floor bicycle pump, so you use 2 hands...
I'm way too cheap to drop $500 on ANYTHING paintball, much less a compressor.
This pump is manual, and you can literally take it to the field with you and fill it while sitting in the dead zone!
Here is a similar one. Air Venturi G4 Hand Pump, Hose with 1/8" BSPP Threads. Hand pumps.
Here is the tanks they sell... But, they say they aren't paintball compatible?... I guess because they are lower psi output? Benjamin Air Tank, 2000 psi Output. Scuba tanks & air reservoirs.
I would have thought someone would have tried this before? Especially on this site...