Depending on the where the crack is a good welder might be able to fix it as long as it wasn't a stress related crack and even then maybe. It is not the most desirable option but may be the most economical alternative. I guessing that the damage was road, was it?

Edit:

RPM's post beat mine in, but if I were you I would would go for the one on eBay. Your's could still be fixed at a latter date if needed.