Hi Lavinia,
there was (what looked like) a good one in Unique cars this month, but it may be gone by now
http://www.carpoint.com.au go to used cars then search for FC Holden etc. it was in NSW. Another good site for straight country cars (also in NSW/QLD is
http://www.checkoutclassifieds.com.au I searched for a long time for a straight FC ute and ended up getting one through QLD Holden Restorers. The guy there is Alan Leggatte 07-4662-4378 he has a network of people that scout for him around country NSW and QLD, he found me a straight (but unrestored) ute for $1,000 and is doing some restoration work on it right now before I pick it up. He is based in Dalby, and there is a huge sandblasting plant up there. They have stripped the car and blasted back to bare metal, rustproof etc. they can also paint, re-trim, re-build mechanicals. I can't recommend their work until I see how it comes up, but they seem pretty genuine and cheap. They have a web site
http://www.workin4u.com/qldholdenrestorers may be worth a look. Good luck, the more FC's back on the road the better !!!
