We dont even have borax available in supermarkets here in Norway. First I ordered some in the pharmacy; expensive,but you dont need a lot. Later I bought it at a chemical supplier; same place where I buy lugol. (I run a company and can by "chemicals") It is ever so hard to buy supplements in this country; everything is a "drug" here; like St Johns worth, melantonin, C vit powder is (only sold in pharmacy and cost a fortune ), vitamin B is illegal in higher doses and so on.
I have to do all kinds of bucking and sneaking to get what I want. Recently I found out you can buy supplements in the horses shops, or aquarium shops; both vitamin c and Lugol is available here. I dont know if the 20 mule team is pure borax, but according to Ted from Bankok /Earth clinic it is the real thing.