Reason why you are seeing as not available is you are based in UK
If you enter a EU delivery address you can pre order
Thread for UK release it will be live soon as the amaray releases went live today on Zavvi
I expect UK steelbook will be live by end of the week likely on Sat or Sun
Amazon often when listing new titles is initially at RRP
They later before release date drop prices at various stages
Pre order price promise covers any drop in price