A new challenge

I am going to be challenging myself next month by playing a little game. Because of our upcoming adoption expenses, and the fact that we really could stand to cut our food budget (or even have a budget!) I decided for the month of January I will see if we can feed our family of 7 for less than $100 a week. I will keep track of our grocery spending and post an update occasionally. If you have any good tips, links, or recipes to help in this endeavor I would really appreciate it. Let me know if it's ok to post it on here to share with everyone.