You can get Solar Power TPMS Car Tire Pressure System External for $16.99 using coupon code (in Banggood). Just check coupons out (with price alert and history). You probably want to know what is the best price?
Solar Power TPMS Car Tire Pressure Alarm Monitor System Auto Security External Sensor Tyre Pressure Temperature Warning
Latest coupon and price update (UTC):
Banggood ($16.99)
Banggood warehouse is located in China. Good or bad price? This is the best price in history according to CouponsFromChina database! Basically there’re 2 active coupon codes available!
Link: Banggood product page
Price without coupon: $29.99
1. ($16.99): BG56fe39
2. ($26.99): BGAMMT03
apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
This is the best price ever noted in my database!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG181a0e
(probably won’t work, but you can try them out)
Aliexpress
There’re some similar (or not) items 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 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 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)).