K.C.
I think your best bet would be working at a school in a non-academic role. Apply for positions in food services or the front office. You may also be able to be an aide in the library. They may need a playground monitor or lunchtime aide. Without a degree, I don't think you would have much luck being in a classroom setting, either as an aide or instructional assistant. I think a sub job would be out of the question without a degree.
Outside of the school system, maybe something like a coffee house that is busy in the mornings.
Are your kids old enough to be left alone in the morning before school for a bit? Or, is your husband able to stay home until they leave for school? Can they walk by themselves? If so, you can probably apply for jobs at places like Starbucks or breakfast restaurants (IHOP, Denny's) that need morning workers.
You could also consider working as a nanny/babysitter.
Do you have a particular skill or hobby? You might be able to get a job at a nursery or flower shop if you're good with gardening and flowers. You could teach art or music classes if you have skills in those areas. Just think outside the box of traditional jobs and something might come up.