Amazon.com: MOOER Tender Octaver Pro, Stereo Octave Pedal with Adjustable between unison and +1/-1 octave Make Your Harmonization, Pitch Shifting, Whammy and Detune Chorus Effects : Musical Instruments
DOD Effects Meatbox Octaver and Subharmonic Synthesizer Pedal - jimmyegypt.co.uk
TC Electronic Sub N Up Mini Octaver Effects Pedal | Derringers Music Australia