I can sell you a good Sunfish bronze gooseneck for $38 + USPS flat rate shipping (see photo.) E-mail me at: aglos@colgate.edu if you are interested.
I also have spars but can't ship them due to oversized shipping costs, but if you have a way to pick them up, I can sell a boom set with all hardware (including gooseneck) for $75 and a mast for $60.