the daisies are very reasonable in my opinion. I was expecting a large amount in my BEO from floral but was shocked. I don't know what a single daisy would cost, but im using them as my flowers as well so i'll go according to my BEO and give you a few examples...
Bride Bouquet:
Round, French of gerbera daisies AND roses (3 different colors), with 4 single crystals and 1 hidden mickey crystal with 75% ribbon wrap on the stems... $225
Bridesmaids :
Round, French of dark yellow gerbera daisies with blue satin ribbon wrap over 75% of stems... $105/each
Along the aisles we are having on every other row hand tied clusters of hot pink and dark yellow gerbera daisies AND roses with a satin ribbon bow... each cluster is $35. I'm not sure how many flowers are in each cluster though... i think 3 or 4? but this includes daisies and roses, so im assuming just daisies would have been even cheaper.
Sorry I couldn't give you exactly what you were looking for, but hopefully this will help a little bit, at least to give you some sort of rough estimate...
My florist planner is Laura Kidd. She's incredible. So quick to get back to emails and phone calls and just an absolute pleasure to work with overall. She really kept our budget in mind and had a ton of ideas for us. I'd give the disney florist a call and ask to speak to her. She could probably tell you the cost of an individual flower or at least give you some options and estimates
Good luck!!