My kids and I went high raw last summer, and will probably do it again this year.
I really didn't notice a huge difference in the cost of foods. We used to eat meat at pretty much every meal, so that's probably why I didn't notice the difference when we went high raw. It was more that we ate so much in terms of VOLUME, and I had to go shopping more often, than anything else. I mean, I bought bananas by the box, more than one watermelon at a time, things like that.
I lived in a higher cost of living area at the beginning of last summer, but produce was cheaper. (I guess because of competition? I'm not really sure.)
I used a mix of farmer's markets and the grocery store, and bought food wherever it was cheaper. (Although if a local option was only slightly more than something that was imported, I'd try to buy the local and/or organic option.) I did buy the top 12 organic. This year, I've got a garden going that I didn't have last year, and we'll also be going to u-pick farms for berries this year.
I also bought stuff from Just Tomatoes last year, that I ended up not liking, and it was not cheap, so we'll be doing our own drying this year.
I'd give you actual numbers, but I didn't keep track last year.