If you have a Microsoft Licensing account be sure to check it! I have a customer who originally bought a server 2003 with software assurance and so they had server 2008 KMS and MAK keys available. Well today, I look and although their assurance expired recently, they have 2008R2 MAK available, good for 50 activations! Very strange, the 2008R2 software download isn't there, the key probably will disappear eventually because they should not have been eligible in the first place, so I grabbed it just in case. No KMS key unfortunately.