We have previously worked with the open source CMS "DotNetNuke" and have written commercial e-commerce modules for the system.
The module we created is called 'eTailer' and is no longer in active development, however the module was well recieved and reviewed by the community, who scored it an average rating of 4.6 stars out of 5.
We are available on short term .NET consultancy contracts.
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What is DotNetNuke?
DNN is the leading Web Content Management Platform (or CMS) for Microsoft, powering over 700,000 production web sites worldwide. The flexible DNN open source CMS platform also functions as a web application development framework. Depending on your role within your organization, DNN provides powerful benefits to support your Web initiatives.