Why not see if you can pick up a fairly thick pice of steel pipe and cut it in half? Alternatively if you want a nice cheap way of doing it you could always use some MDPE water or gas pipe and cut it in half - find your nearest road works, go speak to the bloke in the hole and there ya go!!

You can then put an ali skin on it and it would be fine.

Andy
PS: The stick a flipper in it and stick it in the arena!