what alot of people do but Im to cheap!!!! is get the web certificate plastic card. It costs $6.95 but then you can use anywhere Mastercard or Visa is used and you can keep adding and subtracting off that card so its a one time time.
What I do is print out the page from web certificates that shows the account number your name and exp. date and take that to TDS and have them run the card manually and buy $DD this is sort of chancey though some CM insists on the plastic card so I just try again someother time.
someone at one time said they go online from Disney.com get a gift card and when that comes take to TDS and get $DD.
The easiest one I just recently found is if you have a trip planned is to call the hotel and use the webbie over the phone it works just like a credit card and pays down your balance.
We have a trip planned to Vegas and I used mine to put on the package.
So whatever works best for you good luck
any more ?S just ask