2.5 ft. DC 5-Volt USB to 9-Volt and 12-Volt Step-Up Converter 25-2 with Digital Display Extension Cord (4-Pack) 5T912 - The Home Depot
USB Buck Boost Converter
2.7 Volt to 5 Volt Boost Converter
Amazon.com: DC to DC Boost Converter, DROK Voltage Regulator Power Supply 2.5-25V 5V 9V 12 V Step Up to 5-25V 24V Adjustable Volt Transformer Module for Phone/Mp3/Mp4/PSP - 090405 : Electronics
5v to 12v, DC to DC Boost converter circuit - Gadgetronicx
5V to 12V Step Up DC-DC Converter - Electronics-Lab.com
5V to 12V Step Up DC-DC Converter - Electronics-Lab.com