ArcGIS Desktop and Server 10.3 are now available for purchase via software.psu.edu.  Cost is $8 to $10 depending on delivery method.  Links are provided below for convenience.

Desktop: https://software.psu.edu/arcgis-desktop-103-media-7674.html

Server: https://software.psu.edu/arcgis-server-enterprise-103-media-7675.html

ArcGIS 10.3 includes new apps and enhancements that will boost your efficiency and extend the impact of your work.  More information can be found here: http://goo.gl/6qSuuI