Typemock ships Isolator for SharePoint
Our friends at Typemock have made it much more affordable to unit test SharePoint applications. With an introductory price of $99, they have shipped Isolator for SharePoint which is basically the same the full Isolator product except that it will only "fake" APIs that are part of the SharePoint API.
http://www.typemock.com/unit-testing-Microsoft-SharePoint.html
Thanks Eli and Roy!
