Thanks for the brilliant advice. I am so "green" when it comes to all matters babies! Those weekend markets sound great and I will definitely look them up for Brissy.

One other question: when you take the bubs out of the (initially) rear-facing convertible seats, if they are still asleep, can you leave them sleeping till they wake or is it not safe?

I have found some old-fashioned mesh bouncinettes in a variety of beautiful colours at Bubs n Grubs (online plus store in Brisbane) and they are only $35 each. So maybe bubs can be brought downstairs near me during the day when they're awake; what do you ladies reckon?
There are a few kids markets around.. Are you nth or sth side Brissy?

You shouldn't leave a baby in the car unattended even at home, but we had a capsule which allowed us to take baby out of the car while sleeping, and we would leave them to sleep in it until they woke naturally (but there is a cost with hiring them). I am a fan, but many people aren't.