'It's sad that most corporates pay for Windows included '
We do buy PCs without any operating system preinstalled. Then install licenses from our license pools (Windows, RedHat, VMWare...)
B2B sales channels offer them. It's just the consumer sales channels that make harder finding models sold without a pre-installed OS, but those who sell "assembled" desktops.
Which makes me wonder how many here really work in a business environment, and how many write just knowing what their local mall sells.