Just check coupons out (with price alert and history). You probably want to know what is the best price?
Material: ABS, Battery For Transmitter: 6×1.5V” AA battery(not included), Frequency: 2.4G, Channal: 4CH, Size: 46×12.5×11.8CM, Color: Orange and Green, Running speed: about 30kmh, Electronic, Charging Time: about 4 hours., Package Size: 49.2×18.1×19.9CM, Voltage of battery: 7.4V, Serviceable time: about 5 to 6 minutes, Input voltage of charger: 100V-240V, Operation distance: about 100 to 150 meters, Battery For Boat: 7.4V Li battery(1500mAh) (included)
Aliexpress
There’re some similar (or not) items on Aliexpress
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. We have found one coupon for this product!
Link: Banggood product page
1. ($56.73): bGhOnEy10
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 and https://couponsfromchina.com/short/5cd
There were country-specific coupon codes published on Couponsfromchina social channels and price alerts. Coupon price may vary by country, because there’re different VAT rates, shipping cost etc. There is a chance that some latest coupons are still working:
Old coupons (from the oldest to the newest): BGplfeilun, 75d037, aff7off, TTxBG10, BGss506, bgssaff9, AFfbG10, 502C6B, BGBFAFF2019, BGCITYADS2019, BGVDay10%off, BG6e8fe5, BG00eb63
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for Feilun FT009 Racing RC Boat.
Price records source(s): Gearbest, 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)).