You can create price alert here, copy coupons and view price history. Do you want to know what the best price is?
ROM 64GB, Display Size 5.5 Inch, RAM 4GB, 64 bit, 4000mAh(typ), CPU MTK Helio X23 Deca core 2.3GHz, Resolution 1920*1080 Pixel, OS Android 7.1
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 and price update (UTC):
Banggood
Banggood warehouse is located in Hong Kong. There is one coupon right now! Check this out.
Link: Banggood product page
1. ($89.99): BGCITYADS2019
paste coupon code in your cart and click Apply 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): BGK8N4, BG11K8N, 7bcdf9
(there’s a little possibility that old coupon will work)
Price history and price alert
Do you need price history chart (for all/most countries) for Lenovo K8 Note 4/64GB? There we go.
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)).