How much does 1 years supply of diapers cost?

It depends on the type of diaper (i.e. premium, mid-cost, or store brand) and how often you change them. (i.e. if your the kind of parent who changes them as soon as even the least amount of urine shows up, or if you wait until they actually use the diaper). However, according to Parents magazine, the average is $600 a year.