Package Contents: 1x Battery Charger, 1x Charging Line, 1x English Manual, 1x Package Bag.
Basically copy coupon, view price history or create e-mail price alert. What is the best price?
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.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. There are no active coupons for this product, but the price is pretty low isn’t it?
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): 60a441, BGVC4, AC18, BGRU706, BGXVC4, BGSM30%, M4BG, BGF1111, fInbG2020, BGff2020, BGSPR, BGTBD, BG1128, 4BLF, BG10OFFAFF1
(probably won’t work, but you can try them out)
Price history and price alert
Price history (for all/most countries) for Xtar VC4 Battery Charger is here. The lowest price was: $14.99.
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)).