Midi controllers under $150 with lots of knobs - Equipment - lines
AKAI Professional MPK Mini MK3 25 Key USB MIDI Keyboard Controller with 8 Backlit Drum Pads, 8 Knobs and Music Production Software, Black - Walmart.com
Dutch 'Tuna Knobs' Invention Turn iPad Into Actual Controller | Gear | Deep House Amsterdam
This Knob-Packed MIDI Controller Is a Remixer's Delight | WIRED