[KrazyCarl92]

Have you considered driving with a dead axle? This is like the kit bot if your team took the time to look at that. Basically a wheel has bearings on it that allow it to rotate freely about its axle with very little friction. Then you can bolt sprockets (or gears) to the wheel itself and drive that sprocket with chain running from the motor (or other gears). This may be easier to do/easier to find with limited resources.

For live axles where the axles actually drive the wheels, many teams use hex shafts. This might be tough to do with limited resources, but the COTS stuff is out there.