Mechanical Numpad for Compact Keyboards - Glorious Gaming
Numpad with rotating knob- for volume control, scrolling, or anything else you want it to be! Coming... soon? (Tee Em) | By Flashquark | Facebook
Custom built Numpad with Encoders and Display (Details in comment) : r/MechanicalKeyboards
RM-Numpad
Looking for a prebuilt hotswappable numpad with a volume knob on it, any good options out there? (I don't trust my soldering skills) : r/MechanicalKeyboards