Are you doing it through fastrackriders.com? If you are, and it is your first time to have a trackday with them, they have a discount for new riders that we can split up. I think it's called "3 and you are free" -- which means that if you introduce 3 new riders to fastrackriders, then your trackday is free. On the AMA track, that's $200 savings, which if split between 4 people becomes $50 discount/person!
Check out the last few messages on this thread: /forum/topic.asp?TOPIC_ID=4903