Update:  The news is still evolving over in Japan regarding the nuclear plant and seems like it has gotten worse or, they are finally admitting how bad it really is, but I did find out some more information about potassium iodide (KI).  This is from the CDC site:
For persons older than 40 years of age, the risk for radiation-induced thyroid cancer is extremely low, while the potential side effects of prophylaxis due to preexisting thyroid disease tend to increase. Adults over 40 therefore do not need to take potassium iodide as prophylaxis for exposure to I-131.


(For kids and those under 40) Taking KI just before or within 1 to 2 hours after exposure to I-131 can block more than 90% of the radioactive iodine uptake by the thyroid.
They include a dosage chart at the site as well and it would be wise for all of us to read and understand the impacts of taking KI.  Zach over at The Next Chapter emailed me to let me know he would mail his supply of KI pills out here and I took him up on the offer - just trying to cover our bases and have enough for the 2nd grader if we need it - Thank You Zach - I will replace your supply and send along something to repay you for your kindness and generosity.

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Yes, we scoured the entire area yesterday trying to locate some Potassium Iodide (KI).  Luckily, B went to a local store that she frequents for herbal teas and homeopathic remedies and found a pretty good supply of kelp powder and kelp supplements which are loaded with the stuff.  KI drops coming in on Tuesday.

Lots of places are sold out or so backlogged they arent taking any additional orders.

Looks like Amazon still has KI drops, pills, etc but it will be 6 10 days before they process and send the order.

Hopefully these KI drops and kelp pills will never be used and they can just be included as part of our kit.

Image screenshot is from KI4U.com website.