I have checked all old coupons and price is 75.59 USD for 1000A 8400mAh (in Banggood). Go down and check coupons out. Remember to check price history if it is available. Do you want to know what the best price is?
Latest coupon code price check (UTC time):
Banggood (75.59 USD)
Banggood warehouse is located in China. Is it a reasonable price for this item? From what I can see this price is higher than average price (63.99 USD). You can get coupon down below.
Link: Banggood product page
Price without coupon: 75.99 USD
Coupon (75.59 USD): BGAMMT03
(CouponsFromChina.com tip: apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGCarEle5, BGb39492, BGSCM11, BG845979, BGLMQ15, BGCAR639, BGNEWYEAR8
(I don’t think these’re gonna work, but you can try ’em out anyway)
Aliexpress
Click here… to search for 1000A 8400mAh Car Jump Starter with Air Compressor on Aliexpress
Here are coupons that you can use.
Price history and price alert
Check out price history chart (for all/most countries) for 1000A 8400mAh Car Jump Starter with Air Compressor.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).