I'm pursuing a stock/option strategy & it requires the tracking of the 40-day historical volatility of a particular stock or index. Unfortunately, I know of noway in obtaining this information for free or at a reasonable price for that matter. Any suggestions from anyone would be greatly appreciated. I tried ivolatility.com however they don't track the 40-day historical volatility but do the 30-day & the 60-day time frames which won't work for my strategy. Thank you for any suggestions.