this is just a thought ... but since you're already paying a pretty hefty amount for the full day Montessori school (at least in my area that would be a lot of $ and I'm in Northwest suburbs of Chicago close to the WI border), how about finding and paying someone who has an in-home daycare or who homeschools their child and would homeschool your child as well and actually would be able to gear it towards your son's needs? I haven't checked into it in depth yet but I don't think it has to be a parent in IL that homeschools, or does it?