I can't believe a manufacturer or assembler (since they don't actually manufacture anything), even such as Dell or HP or Toshiba or Sony, or Asus or Acer etc, cannot simply make up a notebook/netbook without a hard drive or storage unit, add their own choice and offer any OS they want, or the customer selects..
Now it is of course not part of their mandate, to cater to a small minority of users, whether they be Apple OS-X or Linux
--and no doubt it would be a public fight, if for instance Dell took an Intel PC or Notebook and offered to add your OS of choice: Win something ??, Apple OS-X, Linux (which distribution do you want or would you like one pre-made for that machine ?)
And license agreements, even if all the details are unknown no doubt prohibit such creative actions..
That much is fairly obvious
Also obvious is that if you want a custom system, you have to DIY or use an assembler who will, at the usual higher cost, since there are not many bare-bone notebooks (more in the desktop arena), and the retailers who offer for example Linux as the OS to be installed will necessarily have a higher price point, perhaps by a significant amount
--so the usual method for anyone who wants to ditch Microsoft OS for their own choice, is to buy from the volume manufacturers/assemblers, such as Dell, and setup the system themselves (DIY)
Not that the latest Microsoft OS or possible the latest Apple OS-X (or later, Google's Android) is that bad of a choice
--it depends on what you want or think you need now or later, for maintenance of the system, always a chore with some OS types available, not so much with the Linux choice..