We booked ours through AAA and since it goes through WDTC we got 0% interest for 6 months. Since costco takes you through WDTC I would assume it applies as well if you use the disney visa.
I also called back and booked airfare through AAA/WDTC and got 0% interest as well.
Added:
I forgot to mention our very first trip we booked with our disney card, did not get applied. I called memberservices and they were able to tell it was a disney vacation and applied the promotion.
Our Authorized Disney Vacation Planners are here to provide personalized, expert advice, answer every question, and uncover the best discounts.
Let Dreams Unlimited Travel take care of all the details, so you can sit back, relax, and enjoy a stress-free vacation.