1kg Force 10mm Stroke Push Open Frame Solenoid Electromagnet DC 12V: Amazon.com: Industrial & Scientific
5PCS DC 12V 4mm Stroke Mini Push Pull Type Solenoid Actuator Micro DC Solenoid Electromagnet Electric Magnet Valve Open Frame Spring Solenoid Valves Linear Motion: Amazon.com: Industrial & Scientific
Small Lock-style Solenoid - 12VDC @ 350mAh with 2-pin JST : ID 5065 : $7.50 : Adafruit Industries, Unique & fun DIY electronics and kits
uxcell DC 12V 3mm/35g 4mm Push Pull Type Mini Solenoid Electromagnet, Open Frame, Linear Motion: Amazon.com: Industrial & Scientific