Akai mpk Mini Play - $50

Excellent condition midi keyboard with built in sounds and speaker.
Super fun.
One of the best little midi keyboards with a fun additional feature of being able to play stock sounds without a computer.
The new ones are $150.
Some specs: Standalone mini keyboard with built-in speaker and USB MIDI controller Built-in sound module with over 128 instrument sounds + 10 drum kits 25 synth-action mini keys OLED display for easy sound browsing 8 red backlit drum pads (2 banks, 16 total) 4 knobs edit sounds or send midi (2 banks, 8 total) 4-way joystick for pitch and modulation control Built-in arpeggiator 1/8” headphone jack Battery powered using (3) AA batteries