USB Mini-transformer to 12v Fan Adapter Cable - DazMode
5V 2.5A Switching Power Supply with 20AWG MicroUSB Cable : ID 1995 : $8.25 : Adafruit Industries, Unique & fun DIY electronics and kits
Using External Power and USB with the Teensy USB development board
Wall Adapter Power Supply - 5V, 2A, 10W (USB Micro-B) - TOL-16409 - SparkFun Electronics
Battery Eliminator - 4 AAA Battery Replacement - USB Powered
All About USB-C: Power Delivery
FreeDelivery DigitCont 2nd Gen. USB 5V to DC 12V 4mm x 1.7mm Power Cable, Compatible
USB to DC 5.5 Power Cord
USB-C - Wikipedia
Wall Adapter Power Supply - 5.1V DC 2.5A (USB Micro-B) - TOL-13831 - SparkFun Electronics