Just a warning about secound hand cages, a few weeks ago a saw a very nice cage at a thrift store, big and cheap. BUT the previous owner of the cage had the stupid idea to spray-paint it with gold paint, making it unsuitable for birds to live in, as they'd chew off the paint and poison themselves. So just a precaution, if you do see one then inspect it carefully before purchasing it.

Also do you have any "open air markets" around your area? I have one called "Swapmeat" and it's a very good place to buy quality stuff for CHEAP! Bird breeders etc. have stands there weekly and they sell cockatiel sized cages for 10 bucks, and BIG macaw cages for 80. It's great!