Second-hand bike shops? - I'm not sure they even exist. But I think, there are a few bike shops which sell second bikes.
My LBS in Dee Why does, and I got my Trek hybrid from there for a fair price.
http://www.deewhybeachcycles.com.au/...nd%20bikes.htm
On the fixed issue, it depends where you live and commute, and your experience with hills.
Have a look at Bikely, and it's elevation for various sydney rides, to check for yourself.
BTW - Here's the way I usually commute to the city
http://www.bikely.com/maps/bike-path/27619
I consider that reasonably flat, compared to Akuna Bay & some of the other national park rides.
Welcome to the crazyness that is Sydney.



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