I will have to check that out as we use nitrogen from Heatcraft,a supplier to the Refrig and A/C trade.We use quite a few D size nitrogens a year,our rental per bottle is well over $17.00
And coincidently Heatcraft have just started selling D size oxy and acet.I haven't had a chance to have a good look at pricing,but did notice the oxy is very cheap at around $25 a D size bottle.
So BOC need to do something as they are getting competition from everywhere
 
Although, their big market is manufacturing plants,hospitals,etc.
Us little guys are probably not wanted,which is the way many big businesses operate.
Just imagine, as an example, how many $ their account with Qld health would be.
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