Starting 9/1 you can now do so. Also keep in mind that you don’t have to sell 5 of the same thing. You can sell one of the thing you want and four more of the cheapest thing on the price list.
Add 4 cals of Forefront – with a sku code of 37D-00101 . Or sell a Windows 2012 Essentials server. Remember too that R2 of Essentials is expected to RTM at the same time as Server 2012 R2 is and will be available in October along with all the rest of the releases.