Just check coupons out (with price alert and history). You probably want to know what is the best price?
Brand: Xiaomi, Size: 438*346mm, Color: White, Material: ABS, Weight: 0.7kg(Includes Button Battery), Model: XMXHB04JQD, Power: CR2025 Button Battery
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 China. There is one coupon right now! Check this out.
Link: Banggood product page
1. ($53.57): BG00c906
apply code in your basket (cart) after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGMI370, BGMI20IN, bGhOnEy10, BGMG370, BGMH370, BGMU370, BgoFErTaSchInA10, BGMI930, BGMI1007, BgcLuBofErtA10, BGBR861, BGUF119, BGNA121, BGISR1109, BGNA122, BGCY1114, BGMI0221, BGISM1230, BGHU0258, BGAFF10OFF, BGMICZ861, BGEES07, BGCXY101, BGYHT102, BGUL675, BGZSF675, BGCN861, BGALN76, BGBRM783, BGMA097, BGLJJ981, BG465277, BGWT927, BGWSY281, BGHONEY2110, BGb6dbb1, 13f142, BGHUZ03, BG54f82b, BG1f650d, BGaacdf0, BG4133f5, BGfd124b, BG46338f, BG97c665, BG564eb3, BANGGOODSD, BGe1b7fa, BGc93ac5, BGe5057b, BG367966, 00c906, ADMITAD2212, 2022ACTIESNL, BG5eff9f, BG1bad7a, BGf31fdb, BG976b95, BGJUNYB6, BGHUXC108, BGJUNEGSG9, BGRSUNWTB, BGALIBUYZ1, BG8ReviTrage, BG7fb0e5, BGe938cc
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – Xiaomi Mijia LCD Writing Tablet 20 Inch [EU] ($-3)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi Mijia LCD Writing Tablet 20 Inch.
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)).