After going through converting a shop compressor - (about $75 w/ all "doodads"), I ended up with one that worked fine but TOO noisy for my preference. I then spent $100 on one of the little Home Depot portables, which was OK, but still noisy................I then did something I had thought about for a year or two, but never worked up the nerve to try - I went to my local fire extinguisher servicer, and inquired about a CO2 tank and regulator. BEST MOVE I EVER MADE!!! - completely silent, a medium tank will last about a year, even with heavy use, and no need for water filters, as it's completely dry. These can also be had from soft drink vendors........CO2 is what powers the soft drink cup servers you see everywhere.