You can get it if you are eligible for Polish citizenship and have documents proving that your ancestors were Polish citizens. The process is conducted at the Voivodeship Office and basically you can do it yourself. However, taking into account that the whole process is in Polish and not everybody likes bureaucracy, it is good to have a proxy that knows what (s)he is doing (e.g. Patrycja or Gosia 😉 )
Polish citizenship by descent