Entitled? According to law? No. Bad luck, unless they advertised it to you in such a way that you had reason to believe there would be no sales.
But you might be able to get one from HN anyway, because companies can give returns above and beyond the Australian Consumer Law, if they want. Unfortunately HN's returns policy doesn't seem to include any refunds for change of mind or change in price. But you could always contact their customer service and ask.