rich - the sharpe gun is worth the extra $70 trust me..ive gotta harbor freight mini gun that i use for tinting lights and its ok but theres no way i'd shoot a car with it.....i dont even spray with the sharpe at work..i use iwata and i use a sata for primer
rich/BC - i picked both of mine up from my paint supplier at work but ill grab a link for ya in a second
EDIT: ok apparently you can get one at the following places according to their site:
napa..oreilly..mcmaster-carr..medco..angel warehouse..neu tool/supply..snap on..northern tool/equipment..national oak distrib..midstate tool/supply..a-r distrib