Feedback 360 Degree - High Speed Continuous Rotation Servo : ID 3614 : $27.99 : Adafruit Industries, Unique & fun DIY electronics and kits
TowerPro Micro Servo motor - 180 degree - SG90
Pololu - Parallax Feedback 360° High-Speed Servo
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Large Torque TowerPro MG995 DC 4.8v 7.2v Metal Gear Servo Motor 360° Degree Rotation Standard Quality MG 995 For Arduino DIY - Udvabony.com - Electronics, Sensors, Robotics Online Shop