$40.99 – 2000W Modified Sine Wave Inverter (Banggood, Aliexpress: 2000W Modified Sine Wave Inverter – Reliable Power for RVs and Boats with Overload Protection and USB Output – 24V 220V (the best price with coupon)).
I have just checked coupons. The lowest price I could get is $40.99 for 2000W Modified Sine Wave Inverter (in Banggood). You can create price alert here, copy coupons and view price history. What is best price?
Latest price update (UTC time):
Banggood ($40.99)
Banggood warehouse is located in China. Low/high price? Looks like this is great price. I didn’t track lower than that in CouponsFromChina database ever. There is one great coupon!
Link: Banggood product page
Price without coupon: $54.39
1. ($40.99): BG158600
paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/feV
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
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 2000W Modified Sine Wave Inverter. The lowest price was: $40.99.
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)).