Basically copy coupon, view price history or create e-mail price alert. What is best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
– Battery life 2~3years, – Size about 9.5×8.2×2.6cm/3.74×3.22×1.02in, – Pressure unit psi/bar, – Battery built-in Li-ion battery, – Waterproof grade IP67, – RF transmission frequency 433.92MHz±0.1MHz, – Temperature unit Deg.C / Deg.F, – Operating voltage DC 5V, – Working pressure 0 -80 psi (Max) / 0 -5.6 bar(Max), – Funtion Real-time monitoring of tire pressure /High temperature alarm /Low battery alarm /Low tire pressure alarm /Tire pressure high alarm /Air leak alarm /Sensor-update data, – Operating Voltage 5V, – Battery inside Button cell CR1632 (Replaceable)
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($24.38): BGSCM75
2. ($26.05): BG00c906
apply it 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): BG1efeb0, MVC8SPRING, 8BGwbg2204, 8wEbgaInS5, 1653831441, BGdcbfa8, Cuponation9
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Here is price history (for all/most countries) for Wireless Solar TPMS LCD Car Tire Pressure Monitoring System.
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)).