When I was updating this page, then coupon price was 26.99 USD for Solar Power TPMS Car Tire Pressure System External (in Banggood). Check coupons or create price alert down below. Let’s see what best price is ATM.
Latest coupon and price update (UTC):
Banggood (26.99 USD)
Banggood warehouse is located in China. Low/high price? From what I can see this price is higher than average price (23.49 USD). Only one coupon available!
Link: Banggood product page
Price without coupon: 29.99 USD
Coupon (26.99 USD): BGAMMT03
(CouponsFromChina.com tip: apply code in your basket (cart) after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BG181a0e
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Aliexpress
Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for Solar Power TPMS Car Tire Pressure System External is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).