I don't know if I can help with resources or not, but I can tell you from personal experience that eating a whole food, from scratch diet is cheaper than SAD, just in the family budget, EVEN eating as an omnivore.
If you want the most expensive foods, eat SAD. They are available at the drive thru, at sit-down restaurants, and burger joints. You can find SAD foods in the grocery store, in the freezer aisle, where Budget Entrees, packed with sodium, HFCS, and MSG and very little nutrition, are found. Ice cream, pizza, toaster pastries and even full breakfasts, ready for the microwave, are also in the freezer aisle. At the VERY CHEAPEST, these convenience foods cost more per serving BY FAR, than simple stuff like oatmeal or fruit, or even whole wheat toast and an egg, cooked from scratch.
Before beginning McDougall, I was an at-home, from-scratch cook for every meal. My food budget for three (me and two teenagers) was probably $400 or so per month. No, I'm not kidding. I am a frugal food shopper and always have been. When I had four kids at home and a husband, the food budget never got over $600 a month.
Now that I'm not purchasing meat, eggs, or milk products, my food expenditures can get to $400 a month, if I buy some cases of canned goods, but to tell the truth, my food costs me much less than that, most months. I spend less than $100 a month at the discount store where i get the bulk of my greens. Probably $150 between Walmart and the local grocery store, and the odd cash here and there when I see something on sale, brings my total to maybe $300 a month. My kids eat with their dad about half the time, and have school lunches which are SAD all the way and cost $20 a month.
Realistically, with buying no junk vegan food, and cooking simple meals from scratch, of veggies, starch roots, and grains, $300 a month is pretty typical.
