Here's a couple compressor links.
The first is
Macromotive with some okay prices on popular compressors & some Viair compressors (no mention of duty cycle, but high PSI).
The second is
Extreme Outback with the Big Red Plus compressor, a belt driven compressor, and, at the bottom of the page, the ExtremeAire which I believe is the same as the BlowJax unit.