diamond club
i spoke to the diamond club in melb late last year, and they offered me the standard package at $248, but were prepared to chuck in an extra $55 single night coupon (so 2x$55 and 2x$120 coupons). Not sure if you want to give it a go, but try calling the diamond desk in Melb - try Melb hilton and ask for them. I think you could still say someone referred you I guess.