Aliexpress
Click here… to search for JDRC S2 RTR 2.4G RC Boat on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (51.84 USD): BG4bf8d7
Coupon (55.50 USD): Cuponation9
(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): BG3412b0, 9OFFSUMMER
(these coupons are old, so probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for JDRC S2 RTR 2.4G RC Boat.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).