ATV purchase advice

Hello people Since we have bought a cottage with larger land now, I would like to know from you what I have to spend for a used ATV. It should only be there as a working machine (must have no road registration, since it is not registered anyway) and should be used mainly in winter as a snow plough. What do you think you have to spend for a used ATV and how much capacity/performance it should have for such purposes. Do you have good addresses where I can get something like this? omme(prefers Saxony)? I know that you get a sliding sign from the dealer but is there any guidance on building your own? Welder and screwdriver experience is available.