How much does this kind of cake run for at Kroger?

I want to buy my friend a small birthday cake for her birthday but I was wondring how much do the mini cakes at Kroger cost? Like the one in the picture!!
http://static.flickr.com/147/434351078_4d74831559.jpg

Wouldn't it make a lot more sense to call the grocery store where you would buy the cake and ask how much it costs? Who here keeps a list of all the grocery stores in the country and what they charge for birthday cakes?