Yahoo

http://help.yahoo.com/l/us/yahoo/finance/general.html
http://help.yahoo.com/l/us/yahoo/finance/basics/fin-01.html

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Google

http://www.google.com/support/finance/bin/request.py?contact_type=pricing

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MSN

Please email the MSN data error reporting link to info@amichel.com if you happen to know it.