Wine shipped as gift to Auz PO box?

I have a good friend who lives in Australia and uses a PO box for his mail. I'm wondering if I would be able to send him a bottle of wine to the PO Box - I know some places won't allow this.

If this is a possibility, can anyone who is familiar with Australian wines recommend something nice? He tends to like reds, and I'd be willing to spend up to about $100US (including the shipping), but of course something somewhat less would be great. Thanks in advance for any information you can give me.