timmmay:skyhigh: I used to fill them at ASCO carbon dioxide in CHC. It cost less than $5 per bottle to fill
Thanks for the tip! I'm in Wellington, but it suggests it can be done elsewhere.
Did you take your own adapter, or did they have one?
They had their own adapter and did them regularly. When I was there another old guy (like 75 yo) was there doing 3 bottles at once. Must be for the Gin and Tonics :)