Microsoft Windows 7 Pro 32/64bit for only $30.54 @ MS EDU STORE
Retail price for the Windows 7 Professional Operating System is $119 but if you purchase it directly at the Microsoft EDU Store you can get it for only $30.54. You just need to have a university email address with .edu in it. This is valid for 1 copy per email address within 12 months. The operating system is also region free and would work on all regions. This edition is targeted towards enthusiasts and small-business users. It includes all the features of Windows 7 Home Premium, and adds the ability to participate in a Windows Server domain. Additional features include support for up to 192 GB of RAM (increased from 16 GB), operating as a Remote Desktop server, location aware printing, backup to a network location, Encrypting File System, Presentation Mode, Software Restriction Policies and Windows XP Mode.