Where do I find the current C or C++ standard documents?

Answer

As of 1st September 2014, the best locations by price for C and C++ standards documents in PDF are:

• C++11 – ISO/IEC 14882:2011: $30 $60 from ansi.org

• C++03 – ISO 14882:2003: $30 from ansi.org

• C11 – ISO/IEC 9899:2011: $30 $60 from ansi.org / WG14 draft version N1570

• C99 – ISO 9899:1999: $30 $60 from ansi.org / WG14 draft version N1256
• C90 – AS 3955-1991: $141 from ansi.org (the Australian version of C90, identical to ISO 9899:1990)