Got historical price data?

Where can I buy/find price charts for a given coin at a given grade? For example monthly or annual values for a 1796 quarter in AU50 going back a few decades.
Who is John Galt?
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I don't know about decades, but you can get pretty good historical information from Heritage's auction archives. Probably about the best free data out there.
<< <i>Where's that auction for the garage full of red books? >>
http://cgi.ebay.com/OVER-11-000-RED-AND-BLUE-BOOKS-1949-to-2005_W0QQitemZ220053906978
Russ, NCNE
Who is John Galt?
<< <i>So no company currently offers an online service that allows the user to see a historical price chart for a given coin at a given grade? >>
Did Heritage's site not work for you?
Check out the Southern Gold Society