Welcome from Australia
Our classified section is a great place to start, we try and update the status when things are sold so you're not mislead, but sometimes people forget to let us know that something is sold. Most here will clean their airbrushes etc prior to sale and will honourably mention any faults. its safer than eBay or amazon used.
BUT if you find something that seems a good deal elsewhere then by all means, link it here and ask for opinions. We'll give you honest feedback, the good, the bad and the ugly or whatever it is you are considering spending your hard earned cash