I got mine professionally fitted for $40.00 in Campbelltown. The guy said it is compulsary & he gave me a certificate, saying to keep it in the car cos if I was pulled over the police could ask to see it & if I didn't have it then I would be fined.

However, my mum wanted to get a base for her car as well & she got it from Babies Galore. They can fit it, but said that it's ok to do it for yourself.

My dad works for NSW Police (not an officer though) and he checked it out & said that I can't be fined for not having it professionally fitted.