Silicon Investor SM gives opening price as well as high, low, close, adjusted volume, and adjusted close. The user can toggle the 200-day display from descending to ascending order. We found IBM, Unicom, and Ford Motor Co. back to January 2, 1968. Finance offers Historical Quotes in daily, weekly, or monthly increments. We found daily quotes for IBM going back to 1962 and Unicom Corp. to 1970.
Finance also includes dividends.