Effective today (Monday July 1, 2013) Windows Small Business Server 2011 Standard has reached ‘End of Sale’ status for the retail version.
You have until Tuesday December 31, 2013 to purchase SBS 2011 Standard OEM version.
Update 7/1/2013: Handy Andy says that you cannot purchase SA for SBS 2011 anymore.
Tip: If you’re buying the OEM version remember that
you have a 90-day window after purchase where you can add Software Assurance to the OEM version. If you don’t add SA, the OEM version is legally locked to that hardware forever.