What kind of problems are you having? I tried to get some over the weekend and the website just wouldn't work for me but tried again tonight and it worked fine, could've just been very busy? Give it another go! Don't think there's such a thing as the standard tickets selling out as they sell on the door as well.
If you manage to get them online, use "EQ21" in the promotional codes and you'll get buy one get one free - if you didn't already know this!
I have just bought 2 for one - thanks for the tip, I didn't know if it would work.
Now I need someone to go with! At least I can offer a free ticket as an incentive.