We got our rego just before the prices got increased and DP wanted to pay half yearly but 1. It costs you more and 2. Seeing as the prices were going to increase I wanted to pay the whole year. I'm glad that we did now, just not looking forward to next year.
We just started 6 month rego's in NSW & when I looked into it, it costs exactly the same. I thought it'd be more for 6 months, but the costs were exactly halved, so come the full year, it was exactly the same price in total. (Exaclty, lol. Sorry)