I am from Poland too (but living in the US). Witamy!
You may want to visit a very good Polish forum: lotnictwo.net.pl
There you will find a vibrant discussion about various options to get your PPL for a reasonable price. However I doubt very much you can get it for less than 5000 Euro anywhere these days. If you read that forum you will find a typical cost of a PPL in Poland these days at around 25-30 tys. zl.