Do a search on the product "Iodoral". I know that the manufacturer sells it online.
I bought mine through the mail from Nutri Pharm at 1(212)983-8291. They have excellent prices, i.e. $22.40 for 90 tablets. The dose my nutritionist told me to take is 12.5 mg daily (which is one pill a day) for two weeks. Then I am supposed to switch to kelp tablets but I don't know the dose of the kelp tablets yet. The staff at Nutri-Pharm is very knowledgeable about what they sell and can probably answer general informational questions if you need them to. They are not MD's, though. You might want to talk to someone preofessional who is well informed about the use of Iodine supplementally to help you decide if Iodine is for you nad how much to take.