A regular sized bag of Iams hairball treatment bag (sorry I don't know the lbs) is about $13 and one can ALMOST get us through the month, but we usually end up getting two so that's $26 plus they get Fancy Feast wet food twice a week and that is .78 cents a week plus treats, we go through about a bag a week and it's $1 a bag, so it's roughly $34 a month.