Just remember that old doesn't mean good OR bad.
Nor necessarily low-cost.
Casio digital pianos are well respected at the lower cost end.
Yamaha and Kawai both make their own keybeds and both make their own quality acoustic pianos ... the skills transfer.
I believe Roland, Nord and Korg all buy in someone else's keybeds (mostly Fatar, I think, though Nord's grans uses a Kawai).
Just about every recent piano has a USB-MIDI interface. All weighted keyboards are heavy-ish ... if you're planning on moving it ofen, check the weight.
The usual advice is to try before you buy, but sometimes that's easier said then done.
FWIW, I use a Kawai MP6 stage piano, now superceded by the MP7 and MP7SE. I usually use the built-in sounds, but sometimes PianoTeq.
My brother chose Roland from which he preferred the sound. I prefer the Kawai's keys. YMMV.
Thoughts on how you plan to use it will help people narrow things down.