Historical data is not cheap if we collect them for many tickers, across many years. Who mind sharing the cost for option data? Feel free to PM or reply.
Which data source(s) are you interested in purchasing? What's the cost? One-time and/or EOD updates? Does their license allow this?
I am mainly interested to build up my EOD options database for backtesting purpose. So it will be one-time for now. I figure if enough people have like-minded objective, we could do something together.