Wheat seeds ($7/5-lb) * (5-lb/2260g) * 204g = $0.63

You're right; the 718g or ~3.5c (after measuring with the scale I just use 1/2 cup scoops now) is about a week's worth of "seed base" for my daily meals. I make a big bowl in the morning and eat it throughout the day, scooping into a smaller bowl.