You can create price alert here, copy coupons and view price history. What is best price?
Input voltage: DC 7 – 32V, Max charge capacity: 300W
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($44.99): BG10BC
2. ($44.99): BGAFF10OFF
3. ($45.99): Parts8
just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): RandyISDT, ISDT12, es446, ISDTQ6, pl00ab2c, 502C6B, Q6PRO, randy19, randy10, Charger12, PU15, BGQ6PRO, BGQ6PRO25, BGISDTQ617, BGQ6PRO20, BGISDTQ6B, pu15, BGQ6PRO50, BGISDTPRO25, AFfbG10, BGQ6PRO1, BG SKU945647, BGVDay10%off
(there’s a little possibility that old coupon will work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – ISDT Q6 Pro BattGo 300W 14A Balance Charger [EU/UK] ($-3)
Price history and price alert
Here is price history (for all/most countries) for ISDT Q6 Pro BattGo 300W 14A Balance Charger.
Price records source(s): Gearbest, 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)).