Our Struggle with a Grocery Budget

This is not a recipe test, but a short vent about our grocery budget. Since the beginning of the year, we have struggled with staying on our very small budget.
Before Daniel was eating solids, we were spending $60 a week for two adults. Now we have moved it up to $70-80 a week for three because Daniel eats so much. However, during most of January we were overbudget so I was beginning to wonder if this was reasonable.
To get back on budget I am currently trying the following things:
buy less meat and cheese- more vegetarian meals
buy in bulk and divide the cost over the number of weeks it will last
get the Sunday paper for coupons (which I have yet to remember to take to the store)
buy all veggies and fruit at a low cost farmers market

Any other ideas would be appreciated. Or post your frustrations here.