Any of those work, although I'm not familiar with kiosk. The cheapest way to buy multi-day passes is advance purchase through a discount vendor like Ticketmania or others.
This trip took us months to plan and part of the fun was adding things to our Disney Folder... we secured our hotel on Expedia, Saved money, then a month later ordered the tickets thru priceline for airfare... added that to the folder, bought the tickets to the park at the Disney Store, into the folder they ewnt, Food Vouchers from e-bay.... paid for everything over the course of 6 months and it hardly hurt at all... fun to pull out the folder, see how we were doing, checking the savings book to see what was next and how much we needed. Everyone got involved, watched for deals, great way to share with the kids and made it a family trip project.