According to official site online booking is only available to season ticket holders at www.eticketing.co.uk/ictfc
I am a season ticket holder but it still isnt there.
Have you followed this instruction:
If you are a regular purchaser but this is the first time using our online booking system-register your account by clicking the button marked 'Activate an Existing Account' above. Enter your client reference number (found on your 2008/9 season ticket) and surname, update your personal details and follow the on screen prompts.
I did that and its not there......Feck it, i will buy them on Satuday before the game.