Its $52 according to this link and $13.50 for kids 3-11 (not a bad price for kids)
http://www.mouseplanet.com/articles.php?art=mm030506av
You also get a discount with an AP.
Let me tell you though we thought it was very worth it and are hoping to do it ourselves. The food is very high quality and delicious. There are charecters to take pictures with, a pianist playing all your favorite disney songs by request. One year they had some one carving fruit.
The really nice thing was that everything is spread out so you feel comfortable, the food is repeated so you don't have to walk far, the service was stunning and they don't rush you out. Our group stayed for about 3 hours and had a wonderful time, we didn't eat the whole time (more in cycles through the group). And even though we ate so much, it was all so good we all wish we had, had just one more of something.
Mind you this is coming from some one who HATES buffets!
On discounts I was also thrilled (though don't quote me on this), that my one AP got a discount on everyone in our group of 10, even though we paid on seperate cards. I would expect them to still give the entire bill a discount though with one AP, you just might have to pay with one card or cash.