You can easily convert a fridge compressor into a high pressure air compressor.. A typical fill is 3000 psi, and they are tested to much higher.
On the side it said something along the lines of "3000 psi pressure. but I think that it is easier to bring fluid(water) up to 3000psi than air.
I already have a large shop (non-SCUBA) air compressor that gets the neighbors. These are rated variously 0.5-2.0 cfm/2000-3000 psi.