I don't know exactly how much he eats per month but here is a rough estimate . About one bag of food is $13 and it lasts about a month and a half. We give him about a tablespoon or so of veggies per day and then he gets a few fruits as treats throughout the week, mostly berries (our vet recommended few fruits as they are high in sugar and he has a feather chewing issue) about 1/4 to a 1/2 almond in treats per day and then several times per week he gets beans and egg white. He also sometimes gets some people food treats (bit of bread etc) that are good for him but only in small doses and about a teaspoon of seeds per week or thereabouts. I don't find him very expensive food-wise. But others may have a different experience. Probably only about $5 - $10 per week maybe. Oh and he eats Harrison's pellets which is the brand recommended by the vet but I know there are several great brands out there.