Aliexpress
Click here… to search for Enusic T400 Solar Power Motorcycle TPMS on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. I found coupon for you. Check this out.
Link: Banggood product page
Coupon (24.99 USD): BG0adb2a
(CouponsFromChina.com tip: just apply this code in your 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): 13f142, BGHONEY2110, BG10OFFAFF, BGTS56, BGwhielabel, BG10OFFAFF1, BG0f234b, BGaef48d, BANGGOODSD, BGMOTO478, BG00c906, ADMITAD2212, 2022ACTIESNL, Terence, Tabby20, 2203ActiesNL, BG628df7, BGe845a9, BGe43f1c, BG09e9c4, BGa33d53, BG20iMars, BGdcbfa8, BGf9cd16, BGiMars2022, BG237008
(probably won’t work, but you can try them out)
Price history and price alert
Here is price history (for all/most countries) for Enusic T400 Solar Power Motorcycle TPMS.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).