It was $4.15 for a 12-oz Tall size.
Interestingly enough, the creamy combination of vanilla and hazelnut syrups actually tasted somewhat like a frosted cake. It's a pretty nice flavor.
The consistency of the Frappuccino was smooth and not too icy.
Overall, Starbuck's Birthday Cake Frappuccino was pretty good. Most of the birthday cake flavor comes from the shake itself, but the raspberry-infused whipped cream provided a nice accent.