USB Output voltage DC5V /2.1A Max, Output Voltage 220V-240V AC, Type DC/AC Inverters, Output waveform Modified sine wave, Continuous Power 3000W, Peak Power 6000W, Input Voltage 12V DC.
Just check coupons out (with price alert and history). Do you want to know what the best price is?
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.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($61.96): BG845979
2. ($64.14): BGSCM11
you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): BGffa6ea, 8BGwbg2204, BG50offS3, BGAUTO22, BGdcbfa8, DealBGimpact, Cuponation9, 9OFFSUMMER, BGCarEle4, BGCarEle5
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for 3000W Solar Power Inverter DC12V To 240V? There we go. The lowest price was: $40.49.
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)).