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DC 5V Micro 2-Phase 4-Wire Stepper Motor Linear Rail 48mm Stroke Linear Stage Actuator Lead Screw Slider Stepping Motor Small Electric Motor 18 Degree Step Angle: Amazon.com: Industrial & Scientific
Small Reduction Stepper Motor - 12VDC 32-Step 1/16 Gearing : ID 918 : $4.95 : Adafruit Industries, Unique & fun DIY electronics and kits