I just want to give you a pat on the back for doing a great job. Just think of all the money that you're already saving simply by homeschooling!
You don't have to buy uniforms, or worse make sure that your children are wearing all the right labels so that they fit in with their peers. You don't need to concern yourself with daily transportation to school. You don't have to give up your evenings to work bingo or attend PTA meetings. No tuition or after-school tutoring programs to fit into the budget. You don't have to buy those prepackaged expensive lunchables. You don't have to hire a housekeeper or cook, because you've added home-ec to your curriculum :-).
I bet you can think of some more to add to this list. (Feel free to leave them in the comment box.)
Keep up the good work!