Go down and check coupons out. Remember to check price history if it is available. Do you want to know what the best price is?
Diameter 65mm, Detection depth 0.6-40m, Working temperature -20℃-70℃, Color White, Communication mode bluetooth, Sonar frequency 125KHz, 1000mAh, Communication range 50m, Net weight 85g, Gross weight 232g, Battery capacity 3.7V, Working time Less than 10 hours
Aliexpress
I could not find it on Aliexpress. 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. ($132.83): MVC8SPRING
2. ($132.83): 8BGwbg2204
this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): 7bcdf9, BGAFF10OFF, bGhOnEy10, BGdragonBoat, bgshOOp10, BgoFErTaSchInA10, BgcLuBofErtA10, BG11PP12, BGCuponation10, BG10OFFAFF, BGFISH01, BG94d8c2, BG10OFFAFF1, BG4d9120, BG55472a, BG1efeb0
(there’s a little possibility that old coupon will work)
Price history and price alert
Check out price history chart (for all/most countries) for ZANLURE Wireless Sonar Fish Finder.
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)).