Brand KCASA, Detection Range 8 – 9 meters depending on animals size, Infrared Sensor Angle 110 degrees, Power Supply Solar power + 3x AA size rechargeable batteries or 5V / 500mA adaptor, Red Light Indicates the units is activated, Model KC-JK550.
Price history, coupons and price alert are available on this page. Let’s see what best price is ATM.
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. 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
1. ($33.29): BG081591
2. ($34.77): BG589b2e
apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGfa5d3a, BG3397e7, BG5cd82e, BGed41a8, BG3aeccb, Cuponation9, BG8ReviTrage, BGcoupon8off, BGGutscheine, BG00c906, BG8OFFCOUPON, TTBLACK5, BGdbe184, BGf625a4, BG23ALEAprD
(these coupons are old, so probably won’t work)
Price history and price alert
Do you need price history chart (for all/most countries) for Ultrasonic Solar Cat Dog Pest Repeller? There we go. The lowest price was: $19.99.
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)).