Charging time 3H, Rated energy 118WH, Battery capacity 6400mah/6.4AH, Charging current 3a, Product name Underwater scooter, Plug EU & US, Voltage 18.5V, Model Flying Fish I, Host size 268*87*88mm/10.5*3.43*3.46in, Endurance time Continuous 23 minutes at maximum throttle / 45 minutes in normal use, Host weight 1.5kg/3.3lbs, Main engine thrust 5kgf.
Go down and check coupons out. Remember to check price history if it is available. What is the best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($505.99): BG8OFFCOUPON
2. ($505.99): TTBLACK5
3. ($516.99): BG00c906
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BG6be367, BGa61f2e, BG369949, BGissam389, BGissam15wts, BGc363fd
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for 2Pcs DCCMS Underwater Scooter Set. The lowest price was: $357.49.
Price records source(s): 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)).