You can create price alert here, copy coupons and view price history. You probably want to know what is the best price?
Operating frequency 433.92Mhz ± 50KHz, Power supply Solar power charging, Working temperature -20 °C -75 °C, display way LCD display, Operating voltage 3.7-5 V
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):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($28.15): BGSCM75
2. ($29.11): Cuponation9
3. ($29.43): BG8ReviTrage
paste coupon code in your cart and click Apply 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): 8BGwbg2204, tRaDetRaCKeR, BGAUTO22, BGdcbfa8, 9OFFSUMMER
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for Solar Power TPMS with 4 External Sensors.
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)).