The Raspberry Pi 500 is a mini-PC that’s tucked away within a keyboard, which makes it super portable and easy to plug in wherever you want. It’s the next step up from the Pi 400, utilizing the Pi 5’s hardware to make an even better companion.
I’m thinking that this enclosure should probably also be able to have a SSD drive tucked into it.
The new Raspberry Pi Monitor is also interesting as it can be connected, and powered, directly from the keyboard.
Now that it also includes a GPU, and can run most OSes as well, this all makes it a very compact and useful computer. It looks like it will even handle two display outputs.
The total cost then would probably come to about $220 (with mouse, screen, and power supply), but that really includes everything you need.
See https://www.xda-developers.com/raspberry-pi-finally-releases-monitor