Hey champ. I was on the same boat as you regarding the jersey. The old Penfolds jersey with the numbers on the arms also with the Westmacott boomerang on the front. Being a Foxtel tekky, i was in the guys garage where had his tele set up. All this old sporting garb was hanging on coathangers around the joint. In the corner i noticed the old Penfolds guernsey. I says, "Buddy, nice jersey! Wanna sell it?" Without a seconds delay, he was all for it asking me, how much i wanted to buy it for. I threw out 50 bucks as a starter. SOLD! YOU BEWDY!" Pristine nick too.
But before you ask, no i wont sell it. Just thought i'd share my good luck story with you. Keep an eye on Ebay i would guess as your best shot. Good luck with it all mate.