Price history, coupons and price alert are available on this page. Best price?
Size: 240mm * 170mm * 5.2mm, Product Model: NST115A-C, Product Weight: 190g, Name: Writing Board, Battery Model: CR2016, Pressure Output: 100-200g, Panel: Flexible LCD Panel, Package weight: 240g, Material: LCD; ABS LCD Message Board
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($15.99): BG0f268c
2. ($19.22): tRaDetRaCKeR
3. ($19.22): pROMo8cuPoN
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): BGPL528, BG92aad3, BGa04209, BG443b85
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for NUSITE 11.5 Inch LCD Writing Tablet Colorful.
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)).