Price history, coupons and price alert are available on this page. Best price?
Color Pink/Blue, Weight/Size 150g/D64* H84mm, Heating Mode, High temperature 50 ° C, Input/Output DC5V 2A/ DC5V 1A, Material Aluminum alloy, Battery Lithium polymer battery 3600mAh, 2 Modes: Medium temperature 42 ° C, ABS, silicone
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($29.44): BGHB218
2. ($32.56): BG00c906
this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGBFAFF2019, BGHW2, BGCare2, vipupgrade8, 0e7f33, BGHB20, BGSD52147, 13f142, BGCuponation10, BGHONEY2110, BG10OFFAFF, BGwhielabel, BG10OFFAFF1, BANGGOODSD, BGHealth06, 00c906, BGHealth10D, 2022ACTIESNL
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Here is price history (for all/most countries) for Jeffbona Hand Warmer 3600mAh.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).