Amazon.com: 10 Pieces DC-DC Boost Converter 2A Adjustable Module Voltage Regulator Board Input Voltage 2 Volt-24 Volt to 5 Volt-28 Volt Output Voltage (Without USB Connector) : Electronics
MP2315 Mini Adjustable DC-DC Step-Down Module - ProtoSupplies
Ultra Small Size DC DC Step Down Power Supply Module 3A Buck Converter Adjustable 1.8V 2.5V 3.3V 5V 9V 12V|Integrated Circuits| - AliExpress
Step-down DC-DC Converter Module for Raspberry Pi
ADJUSTABLE DC-DC STEP-UP POWER MODULE 2A BOOST CONVERTER | UUGear
BIGTREETECH DC-DC Stepdown Module - 3DJake International
PTH08T220WAH DC DC Converter Adjustable Power Module 0.69-5.5V 16A T.I.®