I spend about $100 a week at the Commissary (military grocery store), there I get: some of our organic produce, packaged foods, toiletries, chicken/turkey, frozen foods, and dog food.
I spend about $20 a week at the Farmer's Market in the off season, more like $30-35 in the growing season, where I get: free range eggs for $2/dozen, I usuallly buy 2 but sometimes we don't eat them all, organic produce (oranges, strawberries, potatoes, tomatoes, onions) in the off season, and blueberries for $8/gallon during season.
I spend another $40 a week at Publix which has the best selection of organic foods but they are the most expensive, there I get: Organic whole milk for $4.99/gal, organic apple bag for $4.99, organic raisins for $3, and sometimes I buy other stuff there too like other organic produce, seafood (they have the best selection).
Sometimes, maybe 1-2x a month I go to the Asian Market, where I spend $20-30 on specialty foods, like rice noodles, Asian produce, and spices.
Oh and about 1x a month I go to the Health Food Store, where I buy herbal extracts, specialty foods and spices, vitamins, or treats ($20-35).
So in my original estimate of $600-640 that can vary upwards of about $75 depending on how much we need that month.