I don't know but we bought ours from Foxx which deals only directly to companies and not to the public and it was exactly the same price.
I look around at some stuff homebrewers are buying now days and it shocks me what folks will spend. B ut I see your point about this purchase. Time and pressure is all you need while a commercial brewery is trying to get hundreds of gallons of beers carbbed in a few hours. I'm about ready to drop 2.5K on a carbonation wizard that dials in co2 perfectly.
Is Carbonation Wizard a union job?