As an FYI, I just purchased Alhambra tickets for November 2018. I first used a link provided by my hotel. Initially, I was a little stressed, because except for a couple days, tickets were sold out. I then used the "chat" at the bottom of the page. She gave me a slightly different link (all within the same official Alhambra official website) which then did show tickets available. However, the whole month of November is available for sale but shaded to indicate "limited tickets". So I would recommend buying tickets for November ASAP. The link was www.tickets.alhambra-patronato.es. After the initial stressful minutes, the transaction was easy. I used a Master Card because I read on this forum that Master Card seemed to work better. I hope that once in Spain I'll be able to use my VISA since the terms are better. You will need to have your passport number for the transaction. I have read that they will check that tickets match the passport it was purchased under. I think this is a way to deal with ticket consolidators.
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