It’s very simple to work with a 2WD platform if you use an Arduino board. This metal chassis features two DC continuous rotation servo motors attached to two 60 mm wheels. The chassis has also attached a caster wheel that can move over rough or irregular surfaces.
The metal platform can be used as a battle bot platform and is designed with mounting holes for Arduino and sensors.
The chassis can be ordered from Olimex and is priced at around 12.00 EUR.