I would try to save the tank if you can. If it's not leaking try to fix the hose lines. Can you put new fuel hose for the vent lines?
Is it still fuel injected?
The worse part is you'll most likely have to order one online. Unless someone has an extra tank laying around.
CIP1 usually has the cheapest prices. But their shipping is very slow. They have a new non-fuel injection tank for $180.
http://www2.cip1.com/ProductDetails.asp ... %2D075%2DL