Hello,
We have an exchange student, who is interested in Parliament House. Now I wanted to buy him the " special " 20 cent coin as a keepsake. I front up, and can only buy this years Coins. I have to order it online because it is last years, they then reply to my order and ring me to say it is ready. Double handling or what ? There may be some weird rule that they can only sell the current years coins in the shop, but for Tourists doing a flying visit they would lose a lot of " impulse " buys.