100% Original New Samson 25 Keys Graphite M25 Mini Usb Midi Controller For Ipad Keyboard Portable For Arranger Performance Stage - Earphones & Headphones - AliExpress
The best wireless & portable Bluetooth MIDI keyboards for iPhone, iPad & Mac - 9to5Mac
iPad Compatible MIDI Keyboards, Controllers (11)
C.24 - The Music Keyboard for iPad by Miselu — Kickstarter