You can try Blackwoods or similar. Will probably need to look at a catalog in order to find all the sections they have. The below link shows one type of the bevel end steam pipe they have.
http://www2.blackwoods.com.au/infoBA...2 5&P=2024336 (http://www2.blackwoods.com.au/infoBANKProduct.aspx?SG=2000165&S=4084711&G=2003525&P=2024336)
Corsa
Pm Badvl - he has access to some? from $2 each.
If you buy from reece, say that you're not in the plumbing trade, they may give you more of a discount because you're not trying to do a DIY boiler or something.