It appears that they're gearing up to get it rolling on Adventure Medical Kits Site. You can find the blankets by going to the Survival Section. However, the links to the blankets currently aren't working.

When they do get them up, all you have to do is click into the description, and then you'll be able either add your zipcode to find a store near you, or click on a store to buy online.

Errrr... Or you could do as massacre suggested and find it now. LOL