Just check coupons out (with price alert and history). What is best price?
[EU DIRECT] Cosmobattery Y2000 2000W /2048Wh Portable Power Station Outdoor Powerful Power Bank 640000mAh Lifepo4 Batteries Large Capacity Secondary Battery Solar Panel Powerstation Emergency Backup Power – Universal Plug
Aliexpress
I could not find it on Aliexpress. 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 Europe 
. As you can see I didn’t find any active coupon for this product right now… There’s only 1 record in my database, so I have no idea if the price is OK.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGCAPITALOS8, BG8FORMULAMX, BGBFDAY8, BGNEWYEAR8, BG24PL30JAN1, BGSPRING8OFF, BGHONEYSP, BGESJY8
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
There is only one database record (it was for $978.39), so you can’t see price history chart.
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)).