I'm going to be writing more about this for Cycling '74, but I spent some time yesterday trying to come up with a non-laptop performance system centered around the Arturia Beatstep Pro.
To which I say "No, this is a Winbook TW802 tablet that I got at Microcenter. My open box unit cost $79, but you can get a new one from them for $99."
Produces enough USB power to run the Beatstep Pro, the audio output is good enough to push my mixer, and I now have a backpack-able Max-Beatstep performance rig that actually has a likelihood of being fun!
Check out the TW802 at Microcenter, or on Amazon (where it is a lot more expensive).