These are only $10 and you get a screen https://www.waveshare.com/rp2350-lcd-1.47-a.htm?sku=30557

You can use XIP to run code from Flash, so you can be get away with that in lieu of a decent amount of RAM.

The screens are really fragile, I've stuck my fingernail through three and broke one with an inadvertent tap from a screwdriver.

But they're only $10 and still work as a microcontroller.