Sorry!
How bad of a leak is it? I'm not fond of doing what I'm about to tell you but, have you tried radiator stop leak? If you've never heard of this, it is for real, and yes it works.
Go to your autozone, napa, or whatever, tell them you're looing for radiator stop leak, and they'll point you in the right direction. The kind that I have found to work the best is in a clear bottle, and it has "pellets" in it, looks like hamster food or something. I believe that the brand is Barks or something like that. It really works, with no ill effect that I have ever noticed. Just follow the directions. Good luck!