Can I suggest that if you have been a regular customer before - and have your "customer number" then that you contact the ACO (phone, fax) and order what you usually do.
I have a funny feeling that the reason ACO grandstand etc has not been available is that it is because the ACO hold regular customers orders each year. These only get released if the customer does not book. There was a poster earlier who was not an ACO member, but who got an email saying they were holding his regular order, and invited him to join the ACO to process it!
I contacted the ACO and have just had the invoice for my normal order - ACO Grandstand, MB Camping, Expo parking.
I think the problem may be that they have not communicated this to us all...