What account are you talking about?
Are you asking about the disney blu-ray club? That's a way to get a lot of cheap blu-rays, about 9 for $90, which is an unbeatable deal. Even cheaper than using the coupons. This thread has details.
http://forum.blu-ray.com/showthread.php?t=151870
Or are you asking about disney movie rewards? That's just rewards program where you can use points you get from buying movies for free disney swag.
As for the coupons, amazon will have their own digital coupons for a limited time, a couple of months before release. I usually rely on this thread or the blu-ray.com forums to see when they're put up, as they're only available for a couple of days, maybe a week tops.