Buying a used car can be quite complicated. You should start by providing time and patience. It must surely be made clear to yourself what amount the plans to spend on car purchases (including state fees for invoicing, contract fees for leasing, etc.). It is also important that how much can be spent on the maintenance and maintenance of the car in the future. That puts the initial choices in place. If the budget is limited then luxury class machines could be excluded.
List of Slovakia car sale site.