Be careful from buying on ebay etc. alot of the gyms are made from bits and pieces. that is they grab a section and add it too another part or a different manufacturer. The problem is with that is that they may not fit together properly and or, they are not made from the correct heavy duty steel. If they break or fail, you cannot buy replacement parts.
Anyone living in Sydney, can go to York Barbells and Fitness Equipment in Minto, and buy direct from the manufacturer at wholseale prices. They might be ex demo stock, or sample gyms, but at least you are getting a gym that is warranted.
MightyTriby