If a ticket becomes available the "Sold Out" changes to "Buy", but you have to be lucky to see it because once someone has it in their cart it's back to "Sold Out". What I was seeing last night was that it would appear as Buy for a minute, then go back to sold out, as people looked at the ticket and then after they realised it was a family ticket and stopped the purchase it went back to buy. I did see a second one in the stand beside it a bit later in the evening but they both appear to be gone now.