I was buying 2 bags of Royal Canin. The "Slim" and "Hair and Coat" so that was probably about $23.00 but since it ended up being like 10 pounds of food or so and with one kitty, it doesn't really end up being all that much. B/c that can last me 2 mos or more.
Now I am buying Science Diet Hairball Light which won't last me quite as long.