NOt sure how old your child is, but he may qualify through the public school system. IF he is not yet school age, contact the school board about early intervention. Even if he attends a private school, he can get services. It is free and better than nothing. My son didn't qualify, but the person who evaluated him sent me a bunch of things to do with him, which did help some. You may also be able to find a sliding scale type of deal through Children's Hospital.
COst was a factor for us, so when we were seeing Michael Norman he only went for 30 minutes at a time. Many insurances cover it, but limit the amount of visits or the coverage doesn't kick in until deductible is covered. WHo is your insurance through?