Yeah i think you need to look into things a little, for the Wife, 3yo son and myself we might spend about $100 a week at a supermarket, and then every second week or so will goto a bulk meat butcher and get about $100 worth of meat, I buy whole rump steaks for about $9/kg or scotch fillet for about $12, then 20 chicken breasts at between 6 - 8/kg.
We figure if we are going to eat we are going to eat well so always make sure our food both fruit, veg and meat is good quality.
Shop around and you will find bulk beef for even cheaper than that.