There are 3 prices for this package.

Holywood and Vine is $19.99 (buffet)

Mama Melrose is $28.99 (Italian with flatbread, salad, entree followed by tiramisu)

Brown Derby is $36.99 (full 3 course meal, a la carte)

You are given your Fantasmic seating voucher when you go for your meal.

Remember the only downside is that if it rains Fantasmic may be cancelled at the last minute.
I would advise that you call at the guest servces to confirm in person when you arrive at MGM