I have found that most of out local store will not take printed coupons. So, I try just getting the ones I know I will use mailed to me... mainly Huggies & Pampers - although I do use others now & then.
I do look at the unit price on the store shelves & buy the store brand most of the time. Also, we have started going to a meat market with in the last year... we go about once every 3 months & stock the freezer with meat. I can get all my meat in a frozen bundle for about $2.39# (including hamburger, steak, pork chops, chicken, ham, ribs, roasts, ground sausage & ground beef). Now if I pick stuff from the meat case it does cost a little more. But we get about 50-70# of meat & it last about 3-4 months and we are a family of 5 (2 adults, 3 kids - 6, almost 5 & almost 3).
I also try to stock up on stuff that is on sale... it does seem like everything is on a routation. Things go on sale about every 4-6 weeks... so if you know you will use them get them. I don't really do the meal planning thing like a lot of people say to do. I just buy what I know we will use & try to get a few of them so that I don't need to buy it again till it's on sale again.
We try to buy the fruit that is on sale - we have had luck getting strawberries lately B1G1F & a few weeks ago that has bagged apples B1G1F. Also, in the summer I like to hit the road side farmer markets for fruits & vegtables... they are so much cheeper then stores. Or grow some of your own - even if you have to do it in large pots on a patio.
If I go do the shopping by myself, I can get away with feeding my family on about $300-350 per month - now if I take the hubby & kids... it is closer to $450 or more a month. Still not 100% sure why, but it just works out that way.
Also, I've been finding myself doing more 2nd day meals... we had steak one day, then I used the left over steak to make beef stir-fry. Or eat a roast one day w/ potatoes, carrots & gravy - then the second day, warm up your gravy add in the left over roast cut in small pieces & have over egg noodles... this can also be done w/ chicken & turkey meat.
Good luck finding a way of reducing your grocery budget. It doesn't just happen over night... I have been shopping this way for years & it took me a long time to figure out how to save money. But if you keep trying - you will find your way.