Hi Trent.

We also are MSDN subscribers, but the Visual Studio with Premium MSDN. Didn't know we could get the TS for 5 users!!! Thought it was a higher level of subscription! Will check that.

You are right.  You may have to upgrade your current level of MSDN to include the Team Foundation source, but it is worth the money difference.  Obviously you will have to contact Microsoft, but I think the MSDN subscription with Team Foundation Workgroup is around $2500 annually.