I think that staying home is absolutely the best thing if you have a supportive husband and are willing to make some sacrifices in your lifestyle. And I know it's possible because I'm a single mom of three kids who walked away from her job about 18 months ago to start a daycare center at home (and is now getting ready to resume homeschooling, which was always the goal). There is simply no substitute for being there when your kids get home from school, or for the kids to see you and your husband working together for everyone's benefit.
It's time to take a serious look at your budget to see where things can be trimmed. Coupons don't really work for me because they tend to be for things I don't buy much, like prepared foods, and pet and beauty items. But I drive an old car that's paid for, buy (or are given) most of our clothes and some toys at second hand stores and yard sales. We don't pay for services like housecleaning and lawnmowing (I think it's important for us to know how to do it, even if it's less than perfect). No cable/satellite TV. Most importantly, no buying anything on credit, and really thinking twice about what you buy in the first place. Your life will also become easier if you purge things you don't need from your house. You might want to consider a class like Financial Peace University at daveramsey.com, and an excellent blog at thesimpledollar.com. It might be helpful for you to find that many people out there are trying to do what you are doing.
The other critical element is to have several months' worth of living expenses in savings. In this economy, a year's worth is a good idea.
For a couple of years after the divorce, life was really pretty difficult. And the kids still complain that they don't have some of the luxuries that many of the kids around them have. On the other hand, I have noticed that they really couldn't care less when they receive material gifts! We have started to make progress in setting goals together for meaningful things, like gifts for family members, trips we would like to take together, etc. The kids receive an allowance that they are expected to divide between saving, giving, and spending, and the spending portions needs to cover certain things.
If you couldn't tell, this subject has become very important to me. Our lives have become so much richer as we have become more consciously frugal. Feel free to contact me if you'd like to talk more.