Answer:
It depends on the type of cat food as there are many different kinds for age, weight, hairballs etc. It depends on whether it is dry or canned, types of flavours and size of the package you are buying. It would also depend on the store you are purchasing it from whether and the type of volume the store is purchasing from IAMS.
IAMS is a lower quality food, and often expensive for what it is. The food is predominately made up of cereals which cats have trouble digesting, and contain very little meat. Higher quality brands can be purchased for a similar price.