$39.94 – 1x Plug Adapter according to your country socket size, 1x EU/US Plug, 1x Battery Charger.
You can get LiitoKala Lii-S8 Battery Charger for $39.94 using coupon code (in Banggood). You can create price alert here, copy coupons and view price history. Best price?
Latest coupon code price check (UTC time):
Banggood ($39.94)
Banggood warehouse is located in China. CouponsFromChina software could not find any coupon for this product in Banggood. Is it expensive? Hmmm, price is higher than average (which is $37.56 right now), so better set price alert down below…
Link: Banggood product page
Price: $39.94
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
(these codes were not working in latest coupon update, but you can check them out anyway)
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
Do you need price history chart (for all/most countries) for LiitoKala Lii-S8 Battery Charger? There we go. 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)).