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Umbraco/Plugins And Extensions/Commerce4umbraco
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Commerce4Umbraco
Shopping cart software for umbraco.
See here for more info:
http://www.codeplex.com/commerce4umbraco
or Paul Sterling's blog http://motusconnect.com/blog.aspx
The Umbraco Store is also based on the Commerce for Umbraco extension: http://store.umbraco.org