I have checked all old coupons and price is 109.99 USD for 6000W Peak Car Power Inverter DC 12V To AC 220V (in Banggood). Basically copy coupon, view price history or create e-mail price alert. You probably want to know what is the best price?
Latest coupon code price check (UTC time):
Banggood (109.99 USD)
Banggood warehouse is located in China. There are no active coupons for this product, but the price is pretty low isn’t it? Low/high price? From what I can see this price is higher than average price (103.49 USD).
Link: Banggood product page
Price: 109.99 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGCarEle4, BGb53ed5, BGa4a85b, BGSCM11, BGCarEle5, BG845979, BGLMQ15, BGCAR639, BGNEWYEAR8, BGAMMT03
(probably won’t work, but you can try them out)
Aliexpress
Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for 6000W Peak Car Power Inverter DC 12V To AC 220V is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).