Thinking about buying a new PC

[PapaParrot]

Or used, re-conditioned, does any one know if it is even possible now a days to buy a PC that does not have any OS installed, and preferably no UEFI or secure boot junk, just the legacy Bios. In the past, I have been able to find what I want in "pawn shops", or some PC repair shops, but I am unable to go out much these days, and also in my area there is not much good options, so I am thinking about just online, and have it shipped.
I do not want to get mixed up with Amazon, or Ebay, would prefer to purchase directly from a company. Also am doing some searches, but am interested if anyone has suggestions. It must be compatible /supported by OpenBsd.
Thanks