You can create price alert here, copy coupons and view price history. You probably want to know what is the best price?
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 code price check (UTC time):
Remote Control: 2.4GHz Wireless Remote Control, Detailed Control Distance: 150m, Transmitter Power: 3x 1.5V AA battery (not included), Charging Time: 150~180 minutes, Playing Time: 9~10mins
Price history and price alert
Here is price history (for all/most countries) for QIJUN 1812-1 RC Racing Boat.
Price records source(s): Gearbest
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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)).