Electro-Harmonix The Mole Bass Booster Pedal | Reverb Canada
Amazon.com: Sondery Boost Pedal for Electric Guitar and Bass, Mini Clean Booster Effect Pedal, True Bypass, More or Less 14dB Change for Frequencies Under 250Hz or Above 1KHz, Art Design Foot Pedal :
Markbass MB Mini Boost Compact Boost Effects Pedal For Bass | Musician's Friend