@typhlosion @fireh9lly I've got an MPK Mini Mk2, which seems pretty popular for very portable midi controller without like, being ridiculously expensive (ymmv there, ofc, but "for a midi controller").
I use it a lot, kinda to the exclusion of my larger Livekey 49 (which is nice, shiny, versatile, but heavy & bulky), but that's more accessibility stuff at home and my setup than uh, performing live (which I have 0 exp. with)!
Still, it's a good little keyboard, if little keyboard be what ye seek