Bumping this thread. I was just at costco and saw this deal was going on. They also had $8 off disney animated blu-rays. I bought Ratatioulle for $16.99.
They also had 3 or 4 of those Studio Ghibli blu-rays - Spirited Away, Castle in the Sky, Ariety, etc. I didn't have any of them pricechecked to be 100% sure, but I'm assuming they apply for the $8 off disney animated blu-ray promotion. They should all ring up $16.99.