Aliexpress
Click here… to search for H108 Racing RC Boat RTR on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. There is one coupon right now! Check this out.
Link: Banggood product page
Coupon (60.28 USD): BGVehicles10
(CouponsFromChina.com tip: apply code in your basket (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): 01Express, TTxBG10, BGss9%rc, bgssaff9, AFfbG10, 502C6B, BGBFAFF2019, BGCITYADS2019, BGVDay10%off, FBCOUPON1, BGAFF10OFF, bGhOnEy10, BGdragonBoat, BGSS10%SW, bgshOOp10, BgcLuBofErtA10, BGCuponation10, BGDAVIS, BGHONEY2110, BGVehicle10
(probably won’t work, but you can try them out)
Price history and price alert
Check out price history chart (for all/most countries) for H108 Racing RC Boat RTR.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).