1. Get discounts from Microsoft
If you are a US student, student parent or teacher, Microsoft will provide you with a 10% discount on Windows 10. Your school must be listed in Microsoft’s database, or you may need to call Microsoft to verify your eligibility.
2. Download Windows 10 from genuine Windows 7/8 / 8.1 PC
Windows 7 and 8.1 users using assistive technology can still upgrade to Windows 10 for free when the free Windows 10 upgrade expires.
The only other way to upgrade to Windows 10 for free (until Microsoft has also eliminated this vulnerability) is to download Windows 10 using a PC with a genuine license for Windows 7, 8, or 8.1 and a copy of the activation.
When running the Windows 10 Media Creation tool, you can create an installation media for another PC, or – if you have already run it on the computer you are upgrading, choose to upgrade this PC now.
3. Find Discounts
The prices listed above are the prices set by Microsoft. However, you can buy less of all Windows versions at other retailers.
Not bad, but still a lot of money. Retailers sometimes offer better deals on product key cards. Unfortunately, you are unlikely to find them on Windows 7 or 8.1 because the retail of these Windows versions ends in 2015. However, you may find sales for Windows 10.
If you only receive the product key and do not have a disk, you can purchase a repair/recovery drive or download the appropriate Windows version from Microsoft.
4. Negotiate Volume Licensing
Microsoft doesn’t sell Windows to large organizations the same way it sells to individuals. Instead, it uses “volume licensing” which involves bulk distribution of Enterprise Edition keys for a set price that’s often much lower than a normal installation. You can buy copies under a volume deal for organizations as small as 5 computers, but you have to call into Microsoft’s volume licensing center to get the deal. The Microsoft License Advisor tool can be used to generate a quote without calling the hotline.