#5 CO2 cylinder: USD75.00At a cost of roughly $225.00 for a pressurized system that would take approx.....
CO2 fill: USD15.00
Milwaukee regulator with bubble counter: USD75.00 (inc. shipping)
Total: USD165.00
The price you suggested above must be local. Even in NYC we can do better.
Keeping a 2 litre fermentation system going at maximum output requires most people to use more than 1 bottle per 3 weeks. IME, 1 bottle with a weekly 70% recharge of sugar and yeast; meaning 50 bottles per year.
Andrew Cribb