There are 4 of us, and usually I will do the big shopping every 7-10 days, and spend about $80 or so. (with coupons, and store card) THat is only meat, grocery items, one loaf of bread. In between, about every 3-4 days I spend about $25 on milk, additional bread, etc. I use all the coupons I can, (usually doubled, but tripled this week at a few stores), and since we are close to Shop-Rite, A&P, and Pathmark, I will shop where ever stuff is on sale.....no loyalty for me........saved money is what counts. I have saved 50% (or occasionally more) of my grocery bill.
We also have a store that is a farmers market type place, that sells fruit and vegetables mostly, (much cheaper than grocery stores) but also sells fresh bread, milk ($2.49 yesterday) and eggs (89 cents for extra large), so I usually go there once a week and spend about $10-15 there (no coupons)
I guess total, I spend about $400 a month on groceries