Second hand road bikes in Brisbane

[sssamcz]

On behalf of a good friend of mine I'm trying to find out good places to find a decent quality second hand road bike in Brisbane. What I've got in mind is something 58 cm, quality steel, 10-15 years old, at least 7speed, and around the $500 mark. If anyone knows of good shops or other avenues where he might be able to find such a thing I'd really appreciate it.

Thanks,

Sam