We buy half a cow, and it comes to about $4-5, and that's not including all the extra organ meets we get. Chest freezer is a way to go.You certainly can't get grass fed beef for 3 dollars a lb where I am, either. Calgary, AB, Canada. :P
Oh, and the thing with Macadamia nuts is to make them into a meal, like a breakfast. Then ~ 50 g makes a satisfying experience for under 400 cals, you get great combination of fats, and don't fret over each nut you are eating.