Dave, I've been told that the commercial pumps (compressors) are in the neighborhood of $1 per PSI. 
Have a look toward the bottom of the page: http://www.pomona-airguns.com/PCP%20Accessories.htm
And here: http://www.airgunsofarizona.com/Bauer.html
Being as resourceful as you are, you might consider building something like this: http://www.network54.com/Forum/79574/thr...-pumping--
Have a look toward the bottom of the page: http://www.pomona-airguns.com/PCP%20Accessories.htm
And here: http://www.airgunsofarizona.com/Bauer.html
Being as resourceful as you are, you might consider building something like this: http://www.network54.com/Forum/79574/thr...-pumping--
Willie