Commerce Starter Kit used this so you can download it from http://www.codeplex.com/dashCommerce/SourceControl/DownloadSourceCode.aspx?changeSetId=30316
The Dll is in there and you can use the Commerce.Web/_Dev/ folder to generate the classes
If I am I because I am I, and You are You because You are You, then I am I, and you are you. But If I am I because You are You, and You are You because I am I, then I am not I and You are not You. -Rabbi of Kotzk