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Ditto hand warmers/reptile heater.
Daiso (Japanese discount store) sells hand warmers with an adhesive backing (useful!) for 6 or 8 pieces per pack for $2.80. These don't get as hot as the more expensive ones you find in the pharmacy or pet store so they might be more suitable.
Pros:
-Cheap and very warm and last all night
-useful as a, well, hand warmer.
-you can give them away and make new best friends!
Cons:
-it's disposable so it's gonna cost you every time you use it, and you have to remember to have new ones with you every night.
-might be too hot for your optics' liking and you can't really regulate the heat
-can be too bulky
-have a use-by date
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