second hand bikes in sydney

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ill be hunting for second hand road bikes soon in sydney

anyone have any suggestions on where to start looking and what to look out for? im running a tight ship so will be looking for something under $500 (is that reasonable?) and ive been lurking on ebay for a while

ill be riding it mostly to unsw, a short flat trip of around 20 minutes on a heavy mtb with knobly tires but thinking of wandering down to la perouse and perhaps even up north to epping

thanks guys!