Due to problems with eTicket when we moved to our new servers it has been removed from iTunes so that we can address those issues. Once we know it is working at 100% it will be back up.
The app itself will still works if you have it on your iPhone already. As I said if you are having issues please send an email to the above email address.
Sorry for any inconvenience.
In the meantime the new DISBoards app does work well and is free.