You can create price alert here, copy coupons and view price history. Do you want to know what the best price is?
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 code price check (UTC time):
Screen resolution 1920x 1080P (FHD), CPU Type Intel Core i3-8145U, GPU Brand Intel, Screen size 14.0 inch, GPU Type Intel Graphics 620, Process technology 14nm, Power consumption 15W, Hard Disk Memory 256GB SSD, Graphics Capacity 2G, RAM 8GB
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($479.99): BGXMI5K15
2. ($542.99): Email5
3. ($542.99): BGXMI3K8
just apply this code in your cart 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): BGXM3X, BGXM3S, Wholesale20, BGXM3Y, BGXMI3T, BGXMI3Y, BGXMI3X, BGBFCR28, BGXMI3M, BGXMI3R, BGCITYADS2019, BGXMBF05, BGXMI3K, BGXMI3H, BGXMI3P, BGXMGTS, BGXMI4TG, BGXMI3B, BGXMI3L, BGXMI3BK, BGXMI3BP, BGXMI3BT, BGXMI3G, BGXM457, BGXMI3D, BGXMI3C, BGXMI3N, BGXMR3X, BGXMR3L, BGXMR3P, BGXMR4P, BGXMR5P, BGXMR6P, BGXMR6K, BGXMI3D1, BGXMI3D2, BGXMP3S, BGXMI3D3, BGXMI3D4, BGXMI3D5, BGXMI3D6, BGXMI3D7, bGhOnEy10, BGXMI3D8, BGTT10, BGXMI3D9, BGXMI3K1, BGXMI3K2, BGXMI3K3, BGXMI3K4, BGXMPRO08, BGXMI3K5, BGXMI3K6, BGXMI3K7, BGXMI3K9, BGXMI3K14, BGXMI5K14
(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 Xiaomi RedmiBook Laptop i3-8145U 4/256GB? 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)).