JSumo M1 Arduino Mini Sumo Robot Kit (Unassembled) - RobotShop
Robot-sumo - Wikipedia
Sumo Robot Turkey
3kg Sumo
DIY Sumo Robot - YouTube
Sumo robots fight at the International Robot Sumo Tournament 2015, in the Ryogoku Sumo Hall (Ryogoku Kokugikan) on December 13, 2015. The annual competition brings the winners from 14 robot sumo tournaments
Nano Sumo Robot
A great Mini Sumo Robot: The Pololu Zumo 32U4 OLED robot.
Amazon.com: HEXBUG BattleBots SumoBash Robots, Remote Control Customizable Robot, Sumo Style Gameplay, Toy for Kids Ages 8 and Up : Toys & Games