I'm not POSITIVE it's the same thing, (we sold only one box last year)- but at CVS back in the Pharmacy we stock something called ThyroSafe for fallout. No rx needed, and we've had the same stock for darn near a YEAR, so I HOPE it's got a longer shelf life than that!

I think it came from CVS, but if you ask your pharmacy staff they should be able to order some from the outside vendor and get it in the next weekday.

EDIT: I googled ThyroSafe, and it's Potassium IodIDE....if that's an acceptable substitute.