Yamaha PSR-500 electronic keyboard with stand - $100 (Clackamas Town Center)

The Yamaha PSR-500 is a digital keyboard synthesizer used by many professional musicians, including the likes of Herbie Hancock, Chick Corea, and John McLaughlin.
The PSR-500 is a 61-key keyboard with a built-in sequencer, arpeggiator, and a variety of sounds and effects.
It also has a built-in MIDI interface, allowing it to be connected to other MIDI devices.
The PSR-500 has a wide range of features, including a variety of voices, rhythms, and effects, as well as a built-in mixer and a variety of performance controls.
It also has a built-in sequencer, allowing users to create their own music.