C.R.
Have you tried to get the children on medicaid - there is a great clinic in Plano by the Baptist Church and they only taked medicaid (by the way my granddaughter was on it for two years and the medical care she received was GREAT) they might be able to give you a referral.
Also I currently have no insurance as COBRA was way too expensive but I have purchased a very affordable membership to Ameriplan (which covers my whole household) nd have saved lots on prescriptions and dental care. Spending much less than I would have on insurance and deductibles.