Amazon has the Fibre-Metal by Honeywelll SWHH1 HotHands Heat Pack, Large for $0.77. Save 76%.
Free shipping on your Prime Amazon Day. Also 6% cash back today with a Prime Card.
https://www.amazon.com/Fibre-Meta…0021FC4G
Description:
Soft comfortable lining traps warmth for protection over a wide range of temperatures
Adding UltraWarm heatpacks adds warmth from 130 to 140 degrees over a full work day
Use air activated natural ingredients to heat by oxidation
It is used in vests, shirt pockets and coat
It comes with polybag packaging