M.B.
I'll ignore the "my husband has me on..." except to say that it sure would sound better if you said "my husband and I are keeping to a budget..."
Anyways, you are what you eat and cheaper food doesn't typically equate to healthy eating, although fortunately the price of organic produce has come down over the years, the price for high quality meat has not. You might buy the book (or get if from the library) by Michael Pollan ("In Defense of Food") for your husband so he realizes that you'll likely lose any potential savings in the food budget to healthcare costs down the line. Pollan highlights that the chronic health problems in the U.S. are due almost entirely to the western diet (including cancer). He also notes that Americans now spend far less of a percentage of their budget on food than they did in the past. And, folks in other countries that have lesser occurences of these chronic health problems spend a higher percentage of their income on food. Also, the foods for which there are coupons are rarely (if ever) healthy foods (or real food).
That all said, Costco does have good prices on some healthier foods such as organic/free range chicken, organic frozen blueberries and some organic produce (salad, carrots and if you're luck berries sometimes). Also, some produce isn't so important to be organic like bananas, pineapples, etc. (i.e., things that you peel before eating). Whereas others really should be organic - in particular berries, potatoes, carrots, etc.
I stretch the organic chicken by making fajitas with lots of veggies and slice thin and grilling. Also, a meatless dish once or twice a week using beans, rice, etc. is quite economical. And, if your husband is a meat and potatoes guy this will help him quickly realize what he is getting when he restricts the food budget ;) You might also try to find a local coop for your organic produce.