With the 3.5 inch large TFT touch screen display, you can build a mini tablet PC based on a Raspberry Pi. The display, with a maximum resolution of 480×320 pixels, is simply plugged into the existing GPIO connectors.
€ 29,95 JOY-iT 3.5″ Touchscreen for Raspberry Pi | Elektor

Display: 3.5″ (8.89cm)
Resolution: 480×320 pixels
Touchscreen Type: Resistive
Touch screen controller: XPT2046
Colors: 65536
Backlight: LED
Connection: GPIO header
Aspect ratio: 8:5
Display Size: 85 x 56 (mm)

Productinfo : https://joy-it.net/de/products/RB-TFT3.5
Manual : https://joy-it.net/files/files/Produkte/RB-TFT3.5/RB-TFT-Manual_04082020.pdf