If you install the last version (1.3) of the Azure SDK, you'll now have the possibility to use an Extras small VM size :

For more information about the VM sizes : http://msdn.microsoft.com/en-us/library/ee814754.aspx

To download the 1.3 version of Azure SDK : http://www.microsoft.com/downloads/en/details.aspx?FamilyID=7a1089b6-4050-4307-86c4-9dadaa5ed018&displaylang=en