Tickets for the Saturday and Sunday are just under £50, and concessionary tickets for the Friday CxO day (which I can't make, but I'll be around Friday evening) are less than £30. And I can safely say—again, I always say—that it's the best Drupal value you'll get of any conference or camp I've ever attended.
This year I'm helping out as a volunteer, so you might find me stuck in a particular room, or wearing a particularly garishly coloured T-shirt. But do come and say hi, won't you?
... To do that, of course, you'll need to buy tickets first!