** Go to Deal not working for some reason, here is the direct link (copy and paste): http://www.microsoft.com/student/office/en-gb/default.aspx
** You will need a UK University e-mail address (as that is where the e-mail is sent) **
** Clean install with previous Microsoft OS is not a problem, Clean install with blank hard drive or Linux will require a quick and simple registry hack **
Just saw this on my Uni's website. This seems to be the cheapest 'student' deal for Windows 7 right now.
Scroll down to the "Other Student Deals from Microsoft" box, and click "Learn More" next to the Windows 7 deal. Provide your Uni e-mail address and they will send you an e-mail with a link which verifies you as eligible for purchase.
It is the upgrade version though apparently you can do a clean install with it as well.
Remember to remove the £9.00 " Microsoft Windows 7 Professional (32)64 Bit Disk Kit" so you just get the download and the cheaper price (there will be no difference once you have burned the provided ISO to a disc).
You can choose either the 32-bit or 64-bit editions.
Apologies if already posted, a quick search did not turn anything up.