I recently became a MRR.  Windows 7 Pro for $6 and Office for $6 more, if they are going to low income or tax exempt entities.  You have to buy at least 20 copies of each at a time.  I haven't looked into regular pricing for regular folks.  I believe it is about $100 for a 3 pack of Windows 7.  I'm currently teaching myself how to deploy a customized windows image.  After a couple days of screwing with this I ran into a bug and have to start over.  I just started downloading 158 windows updates again to my reference computer.  Ack.