You could rent TFS? Team Foundation Server can be rented too! If you need to use such Software as a Service, take TFS hosting at tfs4you.com.

We offer hosted TFS, and allow companies to use the software while saving up on time and money. You are not required to pay for setup fees. Choose and try a test plan. You can access TFS from anywhere as long as you’re connected to the internet. You could rent it.