Historical SPX Option Data

frostengine said:
Does anyone know where I can get daily historical option data for SPX? Preferably free.
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This is one is not free but it is from the CBOE (and inexpensive in a sense):

http://www.marketdataexpress.com/dataSearch.aspx

They sell two databases, OPTSUM and Open-Close. If you are intested only in closing prices and volumes/open interest, OPTSUM is the right product. If you want even more detailed information (like the breakdown of the transactions by size and type) then Open-Close is the one to use.
 
You can subscribe to options software like ONE and they have all the data in 5 minute intervals. The cost is around $70/month, and you also get all the features that come with the software.
 
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