Our team has the exact same concern. We are short in resources and equipment to make our own wheels.
However, we are now looking into
http://www.skywaywheels.com
The wheels were used in earlier FRC competitions.
Being a new team, we still haven't fully apprehended the hubs sizes and sprockets we can possibly use. Skyway actually customises your hubs, and we are now working on getting the one which fits out Kitbox chassis