$7.14 – BMAX 4 Slot Battery Charger (Banggood, Aliexpress: Output voltage DC 4.2V 600mAx 4, Input voltage AC 110-240V 50/60Hz, Plug EU plug, Size 125x 92x 30mm (the best price with coupon)).
ATM you can buy BMAX 4 Slot Battery Charger for $7.14 (in Banggood). Price history, coupons and price alert are available on this page. You probably want to know what is the best price?
Latest coupon and price update (UTC):
Banggood ($7.14)
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database. Good or bad price? According to my database, the average price is $7.70 and current price is $7.14, so it’s probably a good price!
Link: Banggood product page
Price: $7.14
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): BgcLuBofErtA10, BGFLS15, 4BLF, BGAFF10OFF, BGHONEY2110, BG10OFFAFF, BGwhielabel, BG10OFFAFF1, BANGGOODSD, 6GSGIT, BGTorch4, 00c906, BGtorch2, BGtorch3, BGAlerabat15, BGtorch7, BGAlerabatI, BGtorch9, BG8Alerabat, BGLED07, BGOutlight10, BG204085, BG589b2e, BGd57765
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
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 BMAX 4 Slot Battery Charger. The lowest price was: $6.94.
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)).