Inland DC-DC Voltage Step Down Module - Micro Center

LM2596S Adjustable DC-DC Step-Down Module - ProtoSupplies

Inland DC-DC Voltage Step Down Module - Micro Center

Adafruit Industries PowerBoost 500 Charger Rechargeable 5V Lipo USB Boost @ 500mA - Micro Center

Inland DC-DC Voltage Step Down Module - Micro Center

Non-Isolated DC-DC Step-Down Converters with Integrated Inductors for Space-Constrained Applications

Inland RPI 4-Channel Relay 5V Shield for Raspberry Pi/ CE Certification - Micro Center

Inland 2 Channel 5V Relay Module - Micro Center

Dorhea 7PCS LM2596 DC to DC Buck Converter Voltage Regulator 3.0-40V to 1.5-35V Buck Converter DIY Adjustable Power Supply Step Down Module : Electronics

This breadboard power supply module is compatible with 5V and 3.3V, which can be applied to MB102 breadboard. The module contains two channels of independent control, powered by the USB all the way.

Inland Breadboard 5V/3V Power Supply Module KS0280

XL7015 DC-DC Dc Converter Step-Down Module 5V-80V Wide Voltage Input 7005A LM2596 : Industrial & Scientific

Adafruit Industries 2x2032 Coin Cell Battery Holder - 6V output with On/Off switch - Micro Center