This is where they provided some information on where you can get free historical option data. You can also get free historical option data if you belong to a university research organization. I forgot which one. Generally there is no free historical data because they are considered proprietary data licensed by CMC so you have to pay for it. No broker provides it for free. I know it's ridiculous. We can get free historical stock data which option data is based on for free anywhere and yet we have to pay for historical option data which is really derived from stocks.