appreciate the follow up..
well, I just had a look through Whirlpool, and someone mentioned Supagas, which is on Fairbairn road, so not too far away. . and I think they mentioned about $25 per bottle.
* Have two bottles to fill, hence looking for a reasonable price.
though as you say, at a pinch , knowing there's one around the corner as a backup and dare I say, more availability with their trading hours.
do you know how much they charge to fill a 9kg bottle..
Just called them for you: $29.90, so a bit more expensive (~35%), but they'll do in a pinch I guess.