$11.99 – that is current price with coupon for TENGOO Heating Pad Feet Warmer (in Banggood). Basically copy coupon, view price history or create e-mail price alert. Best price?
TENGOO Heating Pad for Feet Heating Pad for Men USB Heating Pads Electric Heated Foot Warmers for Women And Men Washable Foot Heating – Grey
Latest coupon and price update (UTC):
Banggood ($11.99)
Banggood warehouse is located in China. Is it expensive? Good news! This is great price, coz it’s the lowest in CouponsFromChina database! One coupon is available. Cool!
Link: Banggood product page
Price without coupon: $12.99
1. ($11.99): BG92e50b
coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for TENGOO Heating Pad Feet Warmer is here.
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)).