K., you'll be using your time as your money now. Many of the moms have given you some great ideas. Here's mine.
I used my time to really shop for my insurance and saved hundreds of dollars doing that. I also hung out my clothes, saved money and got some fresh air. Don't run the washer with just a few clothes. Buying in bulk works *IF* it really is cheaper. Every now and then, it's cheaper to buy smaller. Watch for that. Take your last grocery receipt and go to another grocery store. By checking out all the grocery stores in my area, I found the one that was cheapest for what *I* buy and it really surprised me. Don't use prepared mixes. Find a cookbook for mixes and make your own. Don't cook with prepared stuff; cook from scratch. Cheaper to begin with and healthier -much healthier- in the long run. Use the store brand or off brands. Most of the time, they'll taste just as good and, in personal care, often even better than name brands. Sometimes, those buy-at-home cleaning products, like Conklin, are much cheaper than anything you can buy at the store.
Don't buy new clothes just because "it's time." Wear clothes until they really need to be replaced. I have found brand new clothes at thrift stores like Good Will. When you find a good bargain on children's shoes, etc., see if your budget will stretch to buy those shoes in more than one size. This stretches the savings over a longer period of time.
For medical decisions, take the time to really learn about alternative care. Learn about herbs and things you can do at home to keep from having to go to the doctor. Consider homebirth if you get pregnant. Though many people would scream that homebirth shouldn't be chosen just because it's cheaper, it's as safe as hospital birth (and safer, at times) and cheaper. So, it should be on your radar screen.
Cut your children's hair. When we began homeschooling, we never realized how much we'd save - and our son was in gov't school. We no longer had to come up with $5 here and $10 there and he was so much healthier and we didn't feel the need to have so many new clothes. We didn't buy "curriculum in a box," but put together our own program and bought a lot of it used.
Do simple repairs around the house yourself. Keep up the simple maintenance on your appliances so they won't break down as often.
Find cheap ways to have fun. Don't go to the movies, but rent movies and have your own popcorn and drinks. Ride bikes together or go to the park. Have a real picnic. Play games at home. Have a bonfire, if your regulations allow.
I'd recommend you be careful of dented cans. That can be a problem.
D. S, mother to 5 and been on a tight budget most of my married life