Small Reduction Stepper Motor - 12VDC 32-Step 1/16 Gearing : ID 918 : $4.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: DC 12V Gear Motor Encoder Speed Reduction Gearbox Stepper Motor Reducer Replacement Motor 28BYJ-48 Mini Stepper Motor : Industrial & Scientific
Stepper Motor with Cable - ROB-09238 - SparkFun Electronics