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General Medi-US via Amazon [amazon.com] has 12-Pack General Medi Emergency Mylar Blankets on sale for $6.83. Shipping is free w/ Prime or on orders $35+.

Details:[LIST][*]Specs:Dimensions: 82.6″L x 51.2″W per blanket
Material: 12-micron aluminized polyethylene Mylar
Weight: 1.28 lbs (12-pack)
Count: 12 blankets
Model: HAK-000