340 PLN at the time of submission of the application and 25 PLN for the residence card upon receipt of the decision. If you have a Polish bank account, you can transfer money before visiting the office and print out a confirmation (it must be in Polish) to avoid queues.
Transfer details:
Centrum Obsługi Podatnika
ul. Obozowa 57, 01-161 Warszawa
21 1030 1508 0000 0005 5000 0070
Otherwise you can also pay at the Department for Foreigners. To do this, you need to fill out a short form, which you will find there – the instructions how to do it is here.