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The two options may have lost a comparable amount of premium due to a drop in I.V., but the call gained intrinsic value, whereas the put did not.

Thinkorswim.com lets you can download their trading software for free. Their analysis tools include a feature called "thinkback" that provides past closing prices for options.

An option's value is determined by several factors: - price of the underlying - strike price - time to expiration - implied volatility - dividends - interest rates You have to consider all the "greeks" and even then, understand that they can change by the minute. If you're looking to...

Both Tradeking and OptionsHouse offer very low commissions and decent trading platforms.