$38.23 – 1x Plug Adapter according to your country socket size, 1x EU/US Plug, 1x Battery Charger.
I have just checked coupons. The lowest price I could get is $38.23 for LiitoKala Lii-S8 Battery Charger (in Banggood). Price history, coupons and price alert are available on this page. Do you want to know what the best price is?
Latest coupon code price check (UTC time):
Banggood ($38.23)
Banggood warehouse is located in China. There are no coupons available at this moment in Banggood. The question is – is it a good price? Hmmm, price is higher than average (which is $37.56 right now), so better set price alert down below…
Link: Banggood product page
Price: $38.23
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BgcLuBofErtA10, m9977, FIN7762, BGFLS15, BGAFF10OFF, BGCuponation10, 4BLF, BGHONEY2110, BG10OFFAFF, BGwhielabel, BG10OFFAFF1, BANGGOODSD, BGTorch4, 00c906, BGtorch2, BGtorch3, FIN69483, BGd57765
(probably won’t work, but you can try them out)
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
Check out price history chart (for all/most countries) for LiitoKala Lii-S8 Battery Charger. The lowest price was: $35.99.
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)).