Ip65 Waterproof, Long Control Distance, 0-100 Levels of intensity, Super Bright LED Light, 3 Training Modes.
Basically copy coupon, view price history or create e-mail price alert. What is best price?
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 and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($32.93): BG8ReviTrage
2. ($33.64): BG00c906
put item in your cart and apply coupon code there 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): BGAFF10OFF, BGXQXLJP, 20%DG422, BGPYXLQJP, BG169XGJP, BGJJCWJP, BGDGASG, BGHome15%, BGOCFO674, BGELEHOME76, BGBFHOME82, BGHBHJ105, BGJATD674, BGCuponation10, BGMATH674, 13f142, BGHONEY2110, BGJUZX674, BGRUZW1, BGisly674, BANGGOODSD, 00c906, ADMITAD2212, 2022ACTIESNL, 9OFFSUMMER, Cuponation9
(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 DIGOO DG-L618 Dog Training Collar. The lowest price was: $12.99.
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)).