iRig Keys I/O is an audio interface and MIDI keyboard controller for $199
Amazon.com: Recording Studio Package - Akai Professional MPK Mini MK3 USB MIDI Keyboard Controller and M-Audio AIR 192I4 Audio Interface, with Production Software : Everything Else
ESI - Product Archive: NeON
IK Multimedia iRig Keys I/O - IP-IRIG-KEYSIO25-IN B&H Photo Video
How to connect multiple USB audio devices to an iPad/iPhone - YouTube
CME VX70 Keyboard Controller with Motorized Faders and USB VX70
Best MIDI keyboards 2023: For Mac, PC and iOS | MusicRadar
How to Connect MIDI Keyboard to Audio Interface: Ways & Steps