Can't you just buy the part at Autozone and do it yourself?
Is the line itself rotten and leaking, or is there just a crack in it? You may be able to splice in a new section rather than replace the whole line.
Also, the dealer is usually the most expensive (by far) place to get any maintenance done. I would try to find an independent shop, at least for a quote so you can see by how much the dealer is ripping you off.