Amazon.com: 20KG RC Servo High Torque Servo Motors, Waterproof Full Metal Gear Steering Servo for 1/6 1/8 1/10 1/12 RC Car Robot DIY, Digital Servo with 25T Servo Horn, Control Angle 180° : Toys & Games
Amazon.com: 2Pack SG90 Micro Servo Motor Mini Servo SG90 9g Servo Kit for RC Helicopter Airplane Car Boat Robot Arm/Hand/Walking/Servo Door Lock Control with Cable : Toys & Games
Standard Size - High Torque - Metal Gear Servo : ID 1142 : $19.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Hiwonder HPS-2027MG 20KG High Torque Digital Servo Motor Full Metal Ge