Good lithgows are not rare but getting harder to find. Let's be clear, I said good ones. Most of what you see advertised are average to poor or built up.
Please clarify, are the rifles in the Brisbane shop mostly his own collection or for sale?
Certainly a lot of what is advertised in Australia is overpriced because it's mostly rubbish at good gun prices, but I think four digit prices are in line for good quality matching examples, especially the the earlier years. Try find one!