12V 5A switching power supply : ID 352 : $24.95 : Adafruit Industries, Unique & fun DIY electronics and kits

Electronic Spices 12v 5a Dc Output Power Supply Circuit Board

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Small Push-Pull Solenoid - 12VDC : ID 412 : $7.50 : Adafruit

5V 2.5A Switching Power Supply with 20AWG MicroUSB Cable : ID 1995

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Adjustable Power Supply with 2.1mm / 5.5mm DC - 3V to 12V at 5A

5V 1A (1000mA) USB port power supply - UL Listed : ID 501 : $5.95

12V 5A LED switching power supply - with schematic

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Passive PoE Injector Cable Set : ID 435 : $5.95 : Adafruit