Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (33.29 USD): BG081591
Coupon (34.77 USD): BG589b2e
(CouponsFromChina.com tip: you should apply the coupon 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): BGfa5d3a, BG3397e7, BG5cd82e, BGed41a8, BG3aeccb, Cuponation9, BG8ReviTrage, BGcoupon8off, BGGutscheine, BG00c906, BG8OFFCOUPON, TTBLACK5, BGdbe184, BGf625a4, BG23ALEAprD
(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 Ultrasonic Solar Cat Dog Pest Repeller.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).