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I recall that on the Ticketek web site there was a statement to the effect that the pre-sale was an opportunity to buy before the general public not a guarantee of the best seats available. This is to me a clear indication that some better seats will become available later. The tickets go on general sale in February (I think) but I don't know when the agencies have to advise whether they have sold their full allocation. There are usually better tickets available for sale when the agencies have advised that they have not sold some of their allocated tickets.