2 Button Channel Foot Switch Pedal Replacement For Guitar Amplifier Stack Set | eBay
M-vave ABY Channel Switch Guitar Pedal A/B/A&B Mode Effect Pedal Guitar Parts & Accessories - AliExpress
Donner EC1162 ABY BOX Switcher – Easy Music Center
Dual Switch Auxiliary Pedal - rockstockpedals
A special mini amp channel switcher/FX loop pedal (When you actually only use 1 of the 2 functions and the other is always on or off) Details in comments. : r/diypedals
Build Your Own Guitar Amp Foot Switch (Under $15) - YouTube