DROOPIES official Deluxe Analog Octave Up Pedal | Droopies
Amazon.com: TC Electronic SUB 'N' UP MINI OCTAVER Compact Version of Hugely Popular Sub 'N' Up Octaver with Advanced Polyponic Octave Engine and TonePrint-Enabled Technology for Easy Custom Effects : Musical Instruments
Electro-Harmonix Octavix Fuzz / Octave Up Pedal | Sweetwater