What kind of budget are you thinking?

you might check out the thread I started about this very topic a couple days ago.

If you want to go uber cheap, you can get something like I did, which is a LILYGO T3-S3 bare board. They can be connected to WiFi or bluetooth, which means you can use them with a phone or desktop/laptop for <$25. Just plug them into a usb battery bank to play around with.

Unfortunately most of the embedded devices are only designed to be used with some other kind of interface device. At best they have a couple push buttons for rudimentary menu navigation - Under the $50 price point there are a few that do this, the community favorites from my prior thread seem to be the ThinkNode M1 and the WIO Tracker L1 Pro.

If you want true standalone, built in keyboard and everything, there's really only two options: LILYGO T-Deck and the LILYGO T-Lora Pager, both of which are well north of $100.