I do TJ's and WF, I'd say about 80% of what we eat is organic and unprocessed. $200-250/month for myself and a toddler including wine for me, a few impulse purchases and stocking up.
We eat a lot of dairy, beans, veggies, pasta, rice, eggs. I tend to make our bread, as we don't eat much (easy stuff like baguettes, I'm no gourmet cook/baker). My daughter eats meat 3-4 times a week, I eat it 2-3. A couple packs of TJ's organic chicken breasts (5 breasts each pack) last a month or more. Organic fish we eat once or twice a week, I buy 1-2 fillets, what we don't eat for dinner becomes tuna (or whatever) salad. Dessert is often just a piece of fruit or a fruit tart (again, easy recipe).
Your costs start to add up when you buy the processed stuff, anything that's boxed or bagged. I only pay maybe 10-15% more than I would at a Giant or similar because I buy on sale and in season, and almost nothing that's pre-boxed or bagged.
I am easing into being mostly vegetarian, so I anticipate that our costs will stay pretty much the same for a while.