Answer

An option is a financial derivative that represents a contract sold by one party to another party. The contract offers the buyer the right, but not the obligation, to buy (call) or sell (put) a security or other financial asset at an agreed-upon price (the stake price) during a certain period of time or on a specific date (exercise date).  Six primary factors influence options pricing; the underlying price, strike price, time until expiration, volatility, interest rates and dividends. 

Go to the Business Library's Company & Financial Information section for links to useful resources including links to the following suggested resources:

Bloomberg:  To find current and historical options prices.
Type the ticker symbol of the stock you want.
Hit the EQUITY key then hit GO.
Type: OMON [OMON Stands for Option Monitor].
You will see a screen for all the current options on the stock selected.
Highlight and click on the option you want for a menu - then pick GPO from the menu.
This will give you a current graph of the option price
Change the date range to the time-period you want
Hit the Page Forward key to get the data for the time period.

Datastream: A global financial database which contains current and historical data on stocks, indices, bonds, funds, futures, options, interest rates, commodities, and economic indicators.  Click here for the NYU Datastream Guide.