Nick and PRS are right. Fender will only sell you a replacement neck, and they'll want the broken one off you as well. They won't just sell you a neck.
Warmouth make Fender necks under license, and you will probably find you can get the exact neck you want from their stock. You'll have to get the decal off ebay and all that stuff if you want that.
Pin's ebay plan may be the way forward - although I guess the quality might be questionable depending on source. I'd go for warmouth - having had some experience of their necks / bodies (I have a custom tele made from warmouth parts).