I'm a patient of dr m, I've only ever paid $37 for two boxes of clexane.
Dr m normally does 400mg pessaries and it's cheaper from a compounding chemist. One of the cheapest around is Kingswood compounding and they'll post Aus wide. I think slades in Mel is pretty reasonable too.
Dr m never ticks the ob's thing on my scripts, the pharmacy just charges the pbs price. I'd double check with pharmacy.