Aliexpress
Click here… to search for Xiaomi CARKU X6 12V 10000mAh Emergency Jump Starter on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. I found coupon for you. Check this out.
Link: Banggood product page
Coupon (90.22 USD): BANGGOODSD
(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): BGNew20, alibuy2h, XM15TF, alibuyX6, ineedit5599, Pumps, 30Can, BGMiPower, Brand2, BGalibuyX6, BGStarter2, BG2CAR2, BGALIBUYX612V, BGINEEDIT12V, BG99X6, TS15prime, TISPrime01, Tools1, BGCARKU11, BGCJS2, BGoo1, BG2020NS, BG11BB, BG7723, bGhOnEy10, BgcLuBofErtA10, BGeLt15, BGAFF10OFF, BGCuponation10, 13f142, BGHONEY2110
(there’s a little possibility that old coupon will work)
Price history and price alert
Do you need price history chart (for all/most countries) for Xiaomi CARKU X6 12V 10000mAh Emergency Jump Starter? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).