Radiator tube (not hose)....Where 2 find?

I got a 98 Cavalier, and the tube that connects from the water pump to the upper radiator hose (it's the tube that runs the length of the sideways motor right above the exhast manifold) is rusting out on the underside. Does anyone know where to get a new one, or a good fix for this problem. I know I can get one from the dealership but I'd rather not pay 200.00 for a tube.