I purchased two items for my B1on:
- The “Adafruit in-line Power Switch for 2.1mm Barrel Jack” sells for $5.74 (w/free shipping) on Amazon. It allows you to turn off the B1on AC power using a switch (and more importantly, to turn it back on without unplugging and replugging).
- If you need a power supply (rather than batteries), UsedPedals sells an “9v AC Power Supply for Zoom” on eBay for $8+1.