When I was updating this page, then coupon price was 53.54 USD for S3 RC Boat (in Banggood). Just check coupons out (with price alert and history). Best price?
Latest price update (UTC time):
Banggood (53.54 USD)
Banggood warehouse is located in China. But wait a sec… Is it a good price? Well, this price is higher than average price (52.83 USD) There is one coupon right now! Check this out.
Link: Banggood product page
Price without coupon: 55.19 USD
Coupon (53.54 USD): BGb99f7e
(CouponsFromChina.com tip: coupon code has to be applied in shop’s 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): BG2e2a60, BGSCHOOL8OFF, BG5RCCar, BGRCCar5
(these coupons are old, so probably won’t work)
Aliexpress
Here are coupons that you can use.
Price history and price alert
Do you need price history chart (for all/most countries) for 4DRC S3 RC Boat RTR with 2 Batteries? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).