Ayla, you're fortunate to be able to feed your family such good quality food. It's easy to spend $100/person/week here also if you've switched to an uncompromising view of food. Our govt gives the poorest of us $200/month/person and they base it on factory farm/Walmart prices. Considering that since I switched from grocery store meat to GF/pastured meat, my meat prices have more than doubled, I don't think the amount you're spending is that out of line.
Eg. I often see CAFO t-bone steaks on sale for about $6/lb. I never see GF t-bones for less than $14/lb. Ground beef at Wallyworld is ~$4/lb (pink slime included for free!), but GF ground beef is $8/lb. In a pinch, I'll buy a couple of conventional tomatoes at the corner store for $1.09/lb, but organic tomatoes are on average about $3/lb. The smallest increase I've seen is on half and half - only a 33% increase going from factory to pastured. Butter is about $3/lb factory; pastured is about $5/lb. Store bought sardines in a can might be as low as $1.50 a can, but if you want sustainably fished and bpa-free cans, that goes up to $2.67/can.
As a note, people who have the space and access to buying half and quarter cows/other animals spend much less for GF meat than I do. Also, food prices can vary somewhat in different locations of the US. Even national chains like Costco (a pretty terrific store) and Whole Foods (a mostly good store) can vary a lot in both type of product, price, and sales depending on their location.
All of that rambling aside, I don't know what I spend in a month because I often buy in bulk. Not as much as I'd like because I don't have the space, but 20-30 lbs at a time of one meat or fish when I can save money by doing so. Some of it is offset by the fact that I don't eat many $8 po'boys anymore nor do I eat pizza ever (that's $100/month savings right there). But just guessing, I'm pretty sure I spend $75-100/wk on food for myself. And that's a whole lot more than I was spending when I just threw packs of sale meat into my cart at Walmart.
"Right is right, even if no one is doing it; wrong is wrong, even if everyone is doing it." - St. Augustine