Drivetrain

• 1lbs and 3lbs bots

  • Small gear motors

• 12lbs Bots

  • Cordless drills (cheap and available in various voltages)

• Usable drive motors start around $30 a pair

• You'll need wheels too (and possibly hubs)

• Sources: banebots.com, robotcombat.com, harborfreight.com (drills)