RaspiBlitz and Umbrel will both sell you a pre-assembled device running their Bitcoin+Lightning software suite. You can also make your own by downloading their software onto your own Raspberry Pi or other machine.

"Plug and play" might not be the right term for it though, even if it's easy to get it up and running initially. There is a bit of a maintenance burden associated with running a Lightning node. Setting up channels and dealing with random force closures will require your attention and intervention in a way that a regular bitcoin node doesn't.