I can't remember the cinnamon roll price either, but last I looked they were creeping to that $4 mark. With the pricing the way it is in the new Jolly Holiday Bakery, I would expect a cinnamon roll to be $4-$5 including tax.
I was there last week. If my memory is correct a cinnamon roll was about $5.00 at the cart by the Haunted Mansion that sells coffee and cinnamon rolls. And the churros were $3.50.