We just went to BAB here in the mall. We were making a bear for my cousin for her b-day. I had anticipated around $40 and it was closer to $65. The original bear was 15 or 18 (can't remember for sure), then the kids had to add the talking part so we could send a "we love you" message. Then we got one outfit and each of the three kids were able to pick out one accessory. It was certainly an interesting bear with leather jacket, princess crown, cowbow boots and a pooh bear hunny pot, but she certainly will know who did what!
Now, I wouldn't expect a bear, outfit and an accessory or two to be outrageous, so I'd say $50-60 would not be outside the realm or "reasonable". Though, you'll be at Disney, so there might be more cost on the Disney accessories (like the Disney princesses cost a bit more than the traditional outfits.)