For those who are freezing there fingers off waiting in line at outdoor meetings, gatherings and campsites, or even my two personal favorites, gas stations and bus stops. You can offer these as low as 2$ a piece for as low as 5-6 hours and up to 24 hours of heat provided from each 2$ packet!
Purchase price less than 1$ a piece, at your local department store. Amazon has great deals on hand warmers also. The best ones which work for me are the hot hands hand warmers or grabber. buying a 40 packet case at a deal and selling them at 2$ will return more than double your money, for those exceptionally cold mornings, this hustle works AMAZING!!
Check out this video so you can even see how to reuse them more than once.