Z270 Scuba Diving Snorkel Equipment 10m Breathing Tube [EU] (Banggood, Aliexpress: Electricity 40 Ah, Rated voltage DC 11.1V, Battery capacity 40000mAh, Air supply 52 liters/min, Net weight 5 kg, Maximum dive depth 10 meters, Rated power 180W, Plug EU Plug, Size 320*320*170(mm), Maximum working time 2.7 hours (the best price with coupon)).
Go down and check coupons out. Remember to check price history if it is available. You probably want to know 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 and price update (UTC):
Banggood
Banggood warehouse is located in Europe 
. I don’t really know if this price is reasonable, coz there’s no price history in my DB.
Link: Banggood product page
1. ($496.79): BG8OFFCOUPON
2. ($507.59): BG00c906
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 and https://couponsfromchina.com/short/feV
Old coupons (from the oldest to the newest): tRaDetRaCKeR, BG369949, BGfc8a9a, BGissam15wts, BG073996, BGc363fd
(probably won’t work, but you can try them out)
Price history and price alert
Price history is not available for this item (not enough database records)! The lowest price was $429.99 though.
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)).