Coolant leak help. (Pics)

Oh dear, it seem's my 01' 330ci has a coolant leak. Now I've found the source of the leak, to be honest it looks me right in the eye when I open the hood. There seems to be a small crack in the piece connected to the side of the radiator near the expansion tank, and plenty of coolant around the area to help prove my theory. Now my question is, can I replace this part or do I have to buy a whole new radiator? I know I should probably replace the radiator anyways but I'm a little tight on funds and I'm saving up to get the clutch redone (it's on it's way out). Is there a way to replace this piece or do I absolutely NEED to drop $150 on a new radiator? Any assistance would be appreciated.

Well, it appears my links aren't working for the pictures. If you wanna see them, just right click and click "copy image URL," then paste it into your browser.

Definitely the radiator.
How many miles is on the vehicle?

If the expansion tank is original, then I would highly suggest you replace it too. You don't want an old exp. tank to fail on you, it will be more costly than a failed clutch.

In fact, I would highly recommend you save up the funds to do a complete cooling system refresh.

Ahh... that's exactly what I figured. Well, I guess it's time to dish out a few hundred bucks.... I just hope I can find the time to do the work....

Thanks fore the help!