Amazon.com: DZS Elec 2pcs MP1584EN Mini 3A DC-DC Buck Converter 4.5V-28V to 0.8V-20V Adjustable Voltage Regulator 24V/12V/9V to 12V/5V/3.3V Step-Down Power Module : Electronics
Amazon.com: 12V to 5V DC Converter Car Power Voltage, Waterproof DC 6.3-22V 12V Step Down to DC 5V 3A 15W Voltage Regulator Buck Converter Power Supply Step-Down Module Compatible with Vehicle Car
Amazon.com: DROK® LM2596 Analog Control Buck Converter DC-DC Step-down Transformer Voltage Regulator Module 36V 24V 12V to 5V 2A Power Inverter Volt Stabilizer with Red LED Display Voltmeter Board Input/Output Voltage :
Pololu 5V, 15A Step-Down Voltage Regulator D24V150F5
Amazon.com: 12v to 5v Converter - iGreely DC 12V 24V to 5V 10A Step Down Converter Adapter DC Voltage Reducer Regulator Power Supplies Transformer Module (5V 10A 50W) : Electronics
DC-DC Power Supply Module Step Down 3A output 24V/12V to 5V 3.3V Buck – diymore
DC-DC 0.9-5V to DC 5V Step-UP Boost Voltage Converter Modul
UBEC DC/DC Step-Down (Buck) Converter - 5V @ 3A output : ID 1385 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits
LM2596HV Step Down C M12V/48V To 5V 3A USB Cr MoD*wk £0.99 thenationalherald.com