Computer (Chapel Allerton, Leeds LS7)

I am looking for a working pc tower or desktop computer for a project, preferably with 4gb or more ram and gigabit ethernet. Maybe you have had to buy a new computer to get windows 11 and your old windows 10 computer can't be upgraded to 11 (this would be ok for me as I will be installing Linux instead of windows). I do not need monitor, keyboard or mouse.