You can call and read off a bunch of numbers. I've only put in four so far, but I did them all online. You go into My Disney Experience and look up your reservations. When you open up your reservation, it will tell you how much balance is remaining and then you'll be able to apply payment. The downside is that you can only pay with one gift card per transaction. So, you pay $50 every few minutes. The nice thing is that you don't have to wait on hold and you can do a few now, a few after dinner, a few in a week, until the whole thing is paid for. Seems acceptable in order to save $200 or whatever, though. My local Target has about 25 Disney gift cards at EVERY register. You may find them in one place, along with all the other "entertainment cards" like Chili's, Home Depot, Bass Pro, etc. Some Targets have these at the registers or in the electronics department.