TC Electronic Sub 'N' Up Mini Octaver Dual Octave Pedal – GuitarPusher
Amazon.com: Koogo Guitar Octave Digital Pedal Octpus Pedals for Electric Guitar Precise Polyphonic Octave Effect Generator Pedals With No Distorted Sound : Musical Instruments
MXR Poly Blue Octave Pedal
Boss OC-5 Polyphonic Guitar/Bass Octave Pedal | Sweetwater
Guitar Pedal X - GPX Blog - MXR's New Poly Blue Octave 4-Voice-Octaver, Modulator and Fuzz is a major evolution of their Legendary Blue Box Pedal