Yamaha PSR-EW300 Portable Arranger Keyboard – Battery Powered w/ MIDI (Discontinued) Leave a Comment / Uncategorized / By Alexander / June 13, 2018 91 GEARANK 91 out of 100. Incorporating 300+ ratings and reviews. Street Price: $269.99 Manufacturer: Yamaha Features: 76 Touch-Sensitive Keys Split/Dual Mode 574 Sounds 48-Note Polyphony Backlit LCD