Those cheap M-Audio expression pedals are actually pretty good : r/guitarpedals
Does this count? NPD: M Audio EX-P Expression Pedal. : r/guitarpedals
Foot Pedal for Schatten Pro Pickup Winder - StewMac
Amazon.com: M-Audio EX-P | Universal Expression Pedal for Keyboards & SP 2 - Universal Sustain Pedal with Piano Style Action For MIDI Keyboards, Digital Pianos & More : Everything Else
Restock M-Audio EX-P Expression Pedal | Guitar Center