@mom2rtk Every
Disney travel agent that I've talked to has asked if I want the "no expiration" option and I've read that they've taken it off the boards at the theme parks but that if you ask for it specially that they might be able to still add it.[/QUOTE]
Oh and no I don't believe you can add on the no expiration after you buy the tickets because they are special tickets. But I'm sure that if you bought the no expiration tickets you could still add the PH option whenever you wanted to.
Although Disney had removed the non expiration option from their signage, it was available to upgrade to at Guest Services. HOWEVER, what MOM2RTK was referring to was, as of this past Sunday, February 22, Disney has ELIMINATED the non expiring option for tickets. The authorized WDW ticket sellers still have some supplies of these tickets and will sell them until they run out. Disney will honor all of these already existing tickets but just will not sell anymore.
OP - you can always upgrade a ticket, as long as it's within 14 days of 1st use or before it is used up. If you have a 10 day ticket and decide on day 9 that you want to add Park Hopping or WaterParks , it is added for the entire length of the ticket, even if most of it has been used up. That being said , I believe it is a flat rate/same cost for anything more than a 2 day ticket , approx $58 I believe, and that will cover wether you have a 3 day ticket or 10 day ticket.
Sorry, I have been using mostly Non-expiring 10 PH & WP tickets lately or APs and off the top of my head only know the approximate upgrade prices. The exact amounts are easy to find here or on WDW website, and I'm certain someone here can tell you the exact amount including tax
Also...if you are interested in or think the non expiring tickets might be off value to you, I believe that a few of the authorized ticket sellers for Disney still have some. You can try Undercover Touist, Official a Ticket Center, or Maple Leaf. Also Orbitz and Cheaptickets. I have personally used UCT and OTC, and had excellent service. Across these boards you will find hundreds of positive testimonials on all of these agency's. Touringplans.com, the Unofficial Guide site has a calculator that can tell you who has the best priced ticket that you are looking for. Unless you will be making 3 short trips or more from a 10 day ticket( like two 3day trips and a 4day trip or five 2day trips etc), then the high price of a non expiring ticket would not be worth it for your needs, BUT if you will use it for several short trips it can save you BIG money. My 10 day PH with WaterParks will save me $1154-1516! However I usually use them for single day or 2 day trips combined with party tickets or WaterParks, seaworld etc.
****check out Cheshire Figments sticky on tickets....it explains everything perfectly