Aliexpress
Click here… to search for Solar Power System Kit 18V 4000W 12V to 220V Inverter 30A [EU] on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Europe 
. I don’t want to misguide you about the price. I don’t know if it’s good, because I don’t have enough records in my database… There is one great coupon!
Link: Banggood product page
Coupon (67.65 USD): BGCarEle4
(CouponsFromChina.com tip: put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Price history and price alert
Price history is not available for this item (not enough database records)! The lowest price was 67.65 USD though.
You can set price alert (for Banggood).