Thruster size 114x100x100mm, Shell material PC plastic, Rated voltage 24V, Rated current 17A, Material of adapter Stainless steel, Model TD6E, Product name Booster, Rated power 400W, Size of adapter 135x42x40mm, Thrust range 0-7kgf, Endurance time High-speed 30-40min; Low-speed 1-2h, Thruster weight 550±20g, Speed 3-7km/h / maximum speed 7km/h, Waterproof level IP68.
Basically copy coupon, view price history or create e-mail price alert. 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 and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($183.99): BG8OFFCOUPON
2. ($187.99): BG00c906
just apply this code in your cart 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): BGissam15wts, BG073996, BG369949, BgGoodie9, BGc363fd
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Do you need price history chart (for all/most countries) for TD6E 400W 24V RC Booster Underwater Thruster with ESC? There we go. The lowest price was: $139.99.
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)).