$41.99 – Overload Protection: Yes (120A), Input Voltage: 12 VDC, Input Current: 35A, Output Frequency: 20-120HZ adjustable, Effective range: 1-2 meters, Color: Yellow, Output Waveform: sine wave, Security protection: 12 intelligent security protections, Pulse Width: 1%-12% adjustable, Size: 200 * 100 * 50mm, Gear: frequency conversion / high voltage / low voltage, Drive: Intelligent drive computer board, Power: 68000W, Battery: 12 V DC (any model) (not included).
I have just checked coupons. The lowest price I could get is $41.99 for 420W DC 12V 35A Inverter (in Banggood). Get coupons, create price alert or check price history out! Let’s see what best price is ATM.
Latest coupon code price check (UTC time):
Banggood ($41.99)
Banggood warehouse is located in China. Hmmm… There is no active coupon in Banggood at this moment. The question is – is it a good price? Maybe there’re no more promotions for this item, because current price is higher than average (which is equal $16.99)
Link: Banggood product page
Price: $41.99
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BG8OFFCOUPON, TTBLACK5, BG589b2e, BGET12, BGET10, BG8FORMULAMX, BGf4b80f
(there’s a little possibility that old coupon will work)
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
Price history (for all/most countries) for 420W DC 12V 35A Inverter is here. The lowest price was: $16.99.
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)).