Quote post from another thread on CoC tickets.
I suspect posting in the CoC thread may be helpful to you so people that have gone to CoC can give you info.
But after some googling, here's the official site's tickets page, but the official site hasn't updated with this year's dates and skaters, so I don't think you'll have much luck there. The site redirects you to this page to purchase tickets, and if you click 'booking' it looks like that's where you'd book tickets, but that site is also still not updated with this year's info. But as CoC gets closer, those are the websites I would be checking regularly.