I did book thru DC the last time. When a better rate came out, I called back and changed it. However, they couldn't apply the money that I had already paid to the new ressie. I had used a check and AE card. So, they just put a credit on the credit card and sent me a refund check. Meanwhile, I sent them a check for the new deposit. Now, this time when I booked, I used my DC rate, and put the deposit on my DisneyCredit card. I'm hoping that when I call to change my rate, they'll just be able to switch the deposit over. I certainly won't make the mistake I made the last time and pay for the room completely 6 months out!!!