Ginagirl, when I asked Asset Chemist by email, they told me that the Iodine solution they were selling contained 2.5% Iodine and 2.5% potassium iodide.
On the other hand, I think the Medisca brand from Canada is in the standard strength (i.e. 5% iodine, 10% potassium iodide). A bottle contains 500ml. It is the best deal in my opinion.