I have checked all old coupons and price is $419.99 for Blackview BL9000 5G 12/512GB Dimensity 8020 (in Banggood). Basically copy coupon, view price history or create e-mail price alert. What is best price?
Latest price update (UTC time):
Blackview BL9000 5G 24GB 512GB 6.78 inch 2.4K FHD+ 120Hz Dual Display 120W Fast Charing 50MP 8800mAh NFC Dimensity 8020 Octa Core IP68 IP69K Waterproof Rugged Smartphone – Black
Banggood ($419.99)
Banggood warehouse is located in Hong Kong. As you can see I didn’t find any active coupon for this product right now… Isn’t it too expensive? Good price! It’s lower than average one ($426.66)!
Link: Banggood product page
Price: $419.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG5d8023
(system checks these coupons on every price check (like once per 24 hours), but you can check them 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
Here is price history (for all/most countries) for Blackview BL9000 5G 12/512GB Dimensity 8020.
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)).