HEXBUG is behind some of the coolest robotic toys around. The HEXBUG Boxing Bots allow you to fight against friends. You can control them from your smartphone using the VEX Pilot app. As you throw punches, the robot mimics your move.
The VEX Balancing Boxer kit comes with 2 boxing bots and 615+ snap together pieces. You can order yours for under $150 at this time.