DFRobot 5V 3A Dual USB Step Down Buck Converter Module - RobotShop

5V DC Regulators - RobotShop

5V DC Regulators - RobotShop

5V DC Regulators - RobotShop

UBEC DC/DC Step-Down (Buck) Converter - 5V @ 3A output : ID 1385 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits

Switched Mode Power Supplies - Optimus Digital

DFRobot 5V 3A Dual USB Step Down Buck Converter Module

DC-DC Buck Boost Converter Module (5A)

DFRobot DC-DC Boost Power Supply Module (5x) - RobotShop

DFRobot 5V 3A Dual USB Step Down Buck Converter Module - RobotShop

DC-DC Power Supplies (2) - Optimus Digital

DFRobot 5.5/2.1mm DC to Micro USB Adapter - RobotShop

DC 8~32V to 5V 3A Dual USB Power Step Down Converter - DFRobot