Color Gray, Charging Method USB Charging (USB Cable Length 120cm), Complete Set Size 33*18*3.5cm/12.99*7.08*1.37in, Battery 5000mAh, Power 7.5W, Material ABS+ Diving Material, Heating Gear 3 Gears (45°C/50°C/60°C), Weight 300g.
Get coupons, create price alert or check price history out! Let’s see what best price is ATM.
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
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. ($27.99): BGa66594
2. ($38.21): Cuponation9
3. ($38.63): BG8ReviTrage
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/i1u
Old coupons (from the oldest to the newest): BG7ac30c, BGHB218, BG2d31bc, BG72fff5, tRaDetRaCKeR, BG3fc23d, BGHECARE1, BGMUML65, BG8516c5, BG724b00, BG4ee866, BGb808ae, BG48681b
(these coupons are old, so probably won’t work)
Price history and price alert
Price history (for all/most countries) for Wireless Far Infrared Heated Massage Knee Pad is here. The lowest price was: $24.99.
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)).