Luckily I have a buddy in the fire extinguisher business who got the tank for me for free. The Poly Performance regulator was around $75 and their tank bracket was $30ish. $10 bucks for the Home Depot hose and chuck. $5 for the primer and paint. From what I have read, the regulator and the bracket can be had for a lot less at a fire extinguisher shop. If you don't mind a heavy steel tank, Air Gas sells their used tanks fairly cheap and their refill price is reasonable.
