Hi, RuthieT,
The 5 day hopper (for the price of 3 special) is being offered between early January 2008 and late April 2008. If you are going in December, then the price for the 5 day hopper would be $189 (adult) and $159 (child).
Getawaytoday.com does not mail you the tickets. You will need to go to a ticket booth at the main gate and show them your photo I.D. to receive your tickets. The two Early Entries will be embedded into each ticket's barcode; there isn't a separate piece of paper for Early Entry.
Keep in mind that getawaytoday.com will add a $10 handling charge to your entire order.
The people at getawaytoday.com are helpful and friendly, and I would give them a call to verify everything. Their phone number is 1-866-386-8747 (1-866-FUN-TRIP).
I don't know what it would cost to upgrade to a 6 day hopper, but maybe someone else can chime in about that.
I hope this helps.