Guitar Pedal X - GPX Blog - October Audio releases the really cool F Division Sub Octave Drive - a sort of Monophonic Bass Fuzz Synth with 3 selectable Sub Octaves
MXR Sub Machine Fuzz Octave Pedal M225 – Cumberland Guitars
MXR M287 Sub Octave Bass Fuzz Pedal
USED MXR Poly Blue Octave M306 w/ Original Box - Octave Fuzz Pedal - Matt's Music Center
MXR® SLASH OCTAVE FUZZ - Dunlop
MXR M225 Sub Machine Octave Fuzz Pedal Reviews | Sweetwater
MXR M287 Sub Octave Bass Fuzz Pedal | Sweetwater
MXR Sub Machine Octave Fuzz – Thomann United States
Zeus - Bass Fuzz Suboctave - Red Witch Pedals
MXR M287 Sub Octave Bass Fuzz Pedal with 3 Patch Cables | Sweetwater