Yeah, this is from wine supply companies too. Maybe it's not used as much here, or not readily available in online stores. I'll check around local wine making stores. I'm close to wine making areas, but I'm not sure I'll have access to their suppliers.
I actually made a mistake in my previous post. It was actually 5 grams, not 3 grams for that amount of money. It sounds like I don't actually need much then. That would dose around 180L (48 gal) of milk. AUD $60 = USD $44. It doesn't sound too bad I guess. Obviously the bigger pack is a lot cheaper, but somehow I don't think I'll get through 500g.....
Shane