I got one for $1.99.
For the most part, all your basic sundae components are here except for peanuts. In their stead are fairly large cookie pieces. They were very crunchy (and pretty hard) with sizable chunks of both milk and dark chocolate.
Everything else is pretty much as you'd expect. I'm not a huge fan of Chick-fil-A's soft serve; it has a particular flavor that I found off-putting, but most people like it fine.
Overall, Chick-fil-A's Cookie Sundae was just okay for me. The crunch of the cookies contrasted a little too much with everything else and it ended up feeling almost like two separate desserts.
Nutritional Info - Chick-fil-A Cookie Sundae
Calories - 400 (from Fat - 120)
Fat - 13g (Saturated Fat - 7g)
Sodium - 240mg
Carbs - 66g (Sugar - 52g)
Protein - 6g