When I was updating this page the price was $173.09 for DIDEEP X4000Pro 1L Scuba Diving Tank Equipment (in Banggood). Just check coupons out (with price alert and history). What is the best price?
DIDEEP X4000Pro 1L Scuba Diving Tank Snorkel Equipment Leisure Outdoor Swimming Spare Oxygen Portable Capacity Use 10-20 Minute with Adapter Diving Goggles Strap Bag – Black
Latest coupon code price check (UTC time):
Banggood ($173.09)
Banggood warehouse is located in China. Coupons for DIDEEP X4000Pro 1L Scuba Diving Tank Equipment? Nope, there’re no coupons in Banggood. Price? This price is higher than average price ($170.51) for this item.
Link: Banggood product page
Price: $173.09
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGBFDAY8, BGSPRING8OFF, BGHONEYSP, BGESJY8
(I don’t think these’re gonna work, but you can try ’em out anyway)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for DIDEEP X4000Pro 1L Scuba Diving Tank Equipment is here.
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)).