Amazon.com: Vivlex Octave Guitar Effects Pedal Polyphonic Octave Generator Digital Octaver Mini Stompbox with True Bypass Footswitch for Electric Guitar and Bass LEF-3806 : Musical Instruments
10 Octave Pedals to Audition - Premier Guitar
Eno Ex Oct-1 Octave Guitar Effect Pedal Mini Octave Guitar Pedal True Bypass Guitar Parts & Accessories - Guitar Parts & Accessories - AliExpress