You can create price alert here, copy coupons and view price history. Best price?
BIGTREETECH HDMI Screen IPS 7Inch Touch Screen For Raspberry Pi 4 Manta M4P+CB1 M8P+CB1 FDM Printer MINI PC VS PI TFT50 Screen
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 Europe 
. Too bad there’s no coupon right now in Banggood. I don’t know if this is a good price – number of records in my database is too low!
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Price history and price alert
Well, you won’t see price history chart, coz we have only 1 database record for this item (and price was $54.99).
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)).