Apparently, Microsoft is offering a special discount to college students for Windows 7. All you have to do is provide your college email (.edu) and you can pre-order either Home Premium or Professional for just $30!
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If you want to pre-order Professional instead of Home Edition, simply click on the line where it states "Need to join your school's network or domain? Click Here"
Great news, their old program sold vista for 70$ (and office for 64$), its a big improvement !
most computer science student have it for free with MSDNAA for the duration of our study (most of them, my school decided that we had to pay 75$ fees to get into the program since last week :/) but 30$ for a full license (doesn't expire) I'll certainly get one when the offers extend to Canada