Look into putting the word out at a place like the flash clinic that you are looking for a well seasoned, but not hard abused unit. That might be the best lead given where you are at.

Until then, you may want to consider picking up a cheap welding kit, and put the electrode on a rocker arm, and the strike plate on the stand where you want the light source to be. Step on a bulb release for the shutter at the same time you strike the arc. Vary current and time of welding bead to suit exposure required. Sorry, that is is a little to tongue in cheek to take seriously. I have heard of someone in the last couple of years shooting degaurrotype portraits with 30,000w/s of combined packs. Apparently there was the smell of burned hair after each exposure.