Im using a portable monitor for it. Tried powering it with the rpi but no luck. Im sure there are cheaper ones out there too. Its super light too, so i just 3d printed a mount for command strip hooks to hang it instead of using a vesa wall mount and drilling into the wall.

https://www.amazon.com/dp/B095GG31KX?ref=ppx_yo2_dt_b_product_details&th=1

I got this innoview from Amazon 2 years ago and have been really happy with it. Portable Monitor, InnoView 15.8... https://www.amazon.com/dp/B095GG31KX?ref=ppx_pop_mob_ap_share