Hey mate.
I have a 2009 Nox Airborne, hardtail which I am looking at selling.
It is a DJ/4X bike, so not street specific, but is great to ride, I have barely used it which is the reason for selling, so is in good condition.
I am in Brisbane and can deliver the bike, BUT I'll be honest, I am looking for at least $600, which is over your budget, but thought I would at least send you a message.
Cheers