In addition to CRSP and Datastream (see right), the following resources have historical stock prices:
Yahoo Historical Prices
Daily data with split/dividend adjustments. Does not cover delisted stocks. Downside is that the data is not 100% accurate.
QuantQuote Historical Stock Data
Click on the Free Data tab to access historical data. At present, covers 1988 through mid 2013 for all symbols currently active in the S&P 500. Less errors than Yahoo but covers fewer stocks.
Daily Stock Price Record American Stock Exchange Library Annex HG4915.I22 1969-2002
Daily Stock Price Record New York Stock Exchange Library Annex HG 4915.I23 1972-2001
Wharton Research Data Services
Located on data computer in the Government Documents area of Bartle Library. Restricted to current BU faculty & gradutate students only. Provides historical coverage of major securities from worldwide markets, plus increasing data coverage on emerging markets and new instruments. Includes equity, index, commodity, currency, bond, economic data, and more.
Coverage: varies, with some data going back 30 years. Includes equity, index, commodity, currency, bond, economic data, and more. Data is available in daily, weekly, monthly, quarterly, and yearly formats. Output easily transfers into Excel.