We provide End of Day, (Open, High, Low, Close, Change, Volume & OI) futures prices, free of charge: http://www.mrci.com/ohlc/index.php
We also provide historical prices going back to 2000 within our End Of Day Prices: http://www.mrci.com/ohlc/history.php
Please note: unfortunately, we are unable to sell this data in any other format than how it is already presented on our website.
Below are a few websites of possible data vendors.
Real-Time Service Internet Service History, End of Day Data, Charts http://www.crbtrader.com/
Prophet Historical Data
Internet-Based Charts Data available in formats supported by major software applications http://www.prophetfinance.com
Browser-Based Charting, End of Day Data http://www.pricecharts.com
Real-Time Service Compatible with popular software vendors http://www.futuresource.com
P.C. Quote, Inc.
Real-Time Service Works with popular trading software packages http://www.pcquote.com
Also, some of the exchanges make data available for free. Such as the CME: http://www.cme.com