This one's for calcium reactor users who, like I used to, have to "rent" a Co2 bottle from BOC gases.
Now I found these guys - Gas Cylinder Testing, 17 Westmoreland Street Grey Lynn, phone 378 9243, who will sell you a 2nd hand cylinder.
The cylinder holds 5 - 7kg of gas, comes with a brand new pressure test, is fully loaded with gas, and costs 200 bucks. When it runs out they will refill it for 10 bucks.
Compares very favourably with BOC who continue to extort 12 bucks a month rental you never own the bottle, plus 30 odd bucks to refill.
When I set up with BOC I paid 150 odd bucks for a 1 year rental, plus 30 odd for the gas. Total around 180 bucks and I don't even own the bottle I have to keep paying rent.
I hate telecom style market stranglehold extortion rackets - go Gas Cylinder Testing!