Don't know BM because I only have 10's 11's 12's so far. But I was lucky enough to just pick up a single 2009 for $39 + $5 Express. I think I did ok on this one. Wanted one of them for a while but they usually seem to sell for a lot more than that. Good luck with your Kookaburra hunting.
My view is if you can achieve under $50 for BU, under $65 for proofs you're doing pretty well. Only while spot in the 30-32 range.