Here is a link to a place where you can order DMSA. If you click on this link http://www.vivagen.net/detoxprods.htm and then scroll down to where you will see DMSA (make sure you get the one that says 120 - 25 mg capsules).

25 mg is probably a good one to get, that way you can split the dose in half when you take it to get 12.5 mg, which is a very good starting dose.