As of today it is not required. However, in some cases, the officer at port of entry may ask questions related to medical care and insurance. Having proof of insurance certainly helps.
Green Card holders and visitors with F1 and J1 visas are however required to have insurance under the Affordable Care Act.
Please let us know if you need any further clarification.
Insurance rates are regulated by law. You can't find the same insurance plan for a lower price anywhere else