I have checked all old coupons and price is $67.99 for Smart Portable Fish Finder 100m Depth (in Banggood). You can create price alert here, copy coupons and view price history. What is the best price?
Smart Portable Fish Finder 100M Depth Underwater Visual High-definition Fishing Finder Wireless Sonar Sensor Echo Sounder LCD Fishfinder for Lake Sea Fishing
Latest price update (UTC time):
Banggood ($67.99)
Banggood warehouse is located in China. As you can see I didn’t find any active coupon for this product right now… The question is – is it a good price? This price is higher than average price ($64.99) for this item.
Link: Banggood product page
Price: $67.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGTYPH23, BGTYHOT6, BGESJY8
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for Smart Portable Fish Finder 100m Depth.
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)).