There is no more Autodesk Land software in the market it is relaced by Autodesk Civil 3D. Autodesk stopped sales and support on this. See link below;

http://usa.autodesk.com/adsk/servlet/pc/index?id=3091031&siteID=123112

http://www.thecadmasters.com/wordpress/index.php/2012/04/13/land-desktop...

Autodesk Civil 3D vendors and resellers are shown in the link below

http://usa.autodesk.com/adsk/servlet/ps/searchform?id=1088201&siteID=123112