If you buy 6 or more, then Dell will install whatever you want on the machines. If you just want a single blank machine, phone them.
Otherwise, if it is only Windows yanking your chain, then get a Mac.
Multiple others suggested Dell. Dell will do whatever you want if you phone them. Even though you cannot select a laptop without OS on the web site, they will sell one to you if you call and ask nicely.
If you buy 6 or more, they will even install a special OS setup for you - if you send them a pre-installed disk drive then they will use that to image your machines, so you can buy hundreds or thousands of machines all preconfigured for a large company.
BTW, at the moment, the best laptop machines are Macs. I'm running a Macbook Pro with Linux. It works like a charm and the screen quality is phenominally good.
ebuyer sell laptops without an os.
I just bought a lenovo essential G580 (i3) from ebay. Just look for non OS or Dos OS. Sometimes laptops may come installed with a small linux OS like linpus etc.
Locally i cannot find any osless laptops . weird