$77.99 – 1500W 12V to 220-230V Solar Power Inverter Digital Display USB Modified Sine Wave Transformer Power Supply – KS1000.
According to my DB the lowest price is $77.99 for 1000W 12V to 220-230V Power Inverter (in Banggood). Go down and check coupons out. Remember to check price history if it is available. Best price?
Latest coupon and price update (UTC):
Banggood ($77.99)
Banggood warehouse is located in China. I have no active coupons for you right now. Is it cheap? This price is higher than average price ($50.52) for this item.
Link: Banggood product page
Price: $77.99
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGBFDAY8, BG424324, BGAMMT03
(I don’t think these’re gonna work, but you can try ’em out anyway)
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
Do you need price history chart (for all/most countries) for 1000W 12V to 220-230V Power Inverter? There we go. The lowest price was: $38.99.
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)).