[gyaniv]

First of all you get 2 Toughboxes in the KoP so it is no biggies to build a tank drive from 4 to even 10 or more wheels without much cost.... what is called kitbot...
Other methods are if you have a good sponsor or supplier that can get you some good gear components for free or cheap. For example one of our mentors this year was able to get us some planetary gears for the drivetrain for free so it is better and cheaper...

In my opinion this "tube" wouldn't be much helpful and cheaper for teams because one will cost 295$, you need 2 on the robot so it is more then 600$ with the shipping, and don't forget that you need different chassis for those "tubes" so it will cost more and it can easily get to 700 or even 800$ just the drivetrain, and it is without wheels... and the 2 wheels cost 295$... go figure how much the other configurations gonna cost....
Toughbox costs 88$ so even if you want to go with mecanum and all 4 gearboxes are toughboxes then it is still cheaper since you get the chassis and 2 gearboxes in the KoP and all you have to buy is the mecanum wheels and 2 toughboxes that cost 176$ excluding the wheels