I found a website that has the book Nuclear War Survival Skills by Cresson Kearny for sale for $12.00 a copy or $8.00 for five or more. This is the single best book ever written on how to survive a nuclear war. I highly recommend it. They also have a limited amount of potassium iodide in stock at a reasonable price. The link to their site is http://www.nuclearpreparedness.org/order_form.php
You can buy potassium iodine from a very reputable source here.