I bought tickets last year more than 3 months in advanced and picked them up at the park. Only disadvantage is that I had to get in another line with others who did the same. No problems getting the ticket, be sure to bring the credit card you ordered the tickets with. If you bought one ticket and pick it up at the park the price will be 97.80 with tax and that includes the 2.00 fee. I dont know what is in the coupon book.
I am going at the end of June. If anyone goes any sooner and gets the coupon book, I hope you would post it in this thread. I think that even if you get your tickets mailed to you, you will have to pick the coupon book up at the park, but I am uncertain.
Also, WARNING: You get one coupon book per order. I thought I would order all my tickets separately so I could get a coupon book with each order(that's how I know the price) But for security purposes, the site would only allowed me to make two orders per credit card. So if you do it that way, and need several tickets, be prepared to use more than one credit card.