I just spoke with a youth programs ticketing CM this morning because I had some questions about my order. The prices she quoted were: $195.73 for an 8 day premium (hopping and water parks), and $205.22 for a 10 day premium. (Apparently the 10 day tickets are not standard for them as she had to take my number and call me back after checking on them.) We opted for the 10 day tickets. We probably won't need that many days, but for only $10 more I'd rather have them and not need them than the other way around.
The webiste quoted me $173.68 for a 5 day premium ticket.
I didn't inquire about any other ticket configurations, sorry.
I read here on the DIS that they also offer the open enrollment Y.E.S. programs in September, but I haven't any firsthand experience with that. This will be the first time we have tried it. Both DD and I are looking forward to it.
ETA: Oh! And you do have to purchase the tickets you want in the beginning, when you initially register and order your tickets, as they are not upgradable later on. So you can't change your mind and upgrade them to add hopping while on vacation, or whatever. I hope that makes sense.