I tend to agree with Seedtick. Buying tomatoes out of season is about a waste of time. There are some at Publix that are sold as "tomatoes on the vine" that are half decent and three quarters expensive. Better to wait, or get 'em out of a can like Chuck said.
Preferably from Georgia, where all the finest things in life can be found.
$1.69 / kilo AUS seems like a DEAL. Particularly for local grown. But they are probably still in season down under... March is late summer for you guys, right?