Aliexpress
Click here… to search for 12V Car LED Parking Sensor Kit 4 Sensors 22mm on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. One coupon is available. Cool!
Link: Banggood product page
Coupon (18.89 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): BGe97fd3, BGCarEle5, BGSCM11, BG845979, BGLMQ15, BGCAR639
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Here is price history (for all/most countries) for 12V Car LED Parking Sensor Kit 4 Sensors 22mm.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).