You have to find Polish agency in California. Those agencies do everything: travel tickets, sending packages to Poland, sending money. They will be able to send money for you cheaply. I am just looking at the Polish Business Directory and here you are; Call one of them. They will help you. You see how much they charge for delivering the money to Poland.
1. All Continents Travel 1712 N. Tustin Ave , Orange, Ca C92665 phone 714-974-3620 , they are sending money to Poland.
2. POLAM- 1700 C Tustin ave , Orange, Ca 92865 phone 714-998-1016 , they make international money transfers
3. Modern travel service- 415 N Glendale Ave , Glendale, Ca 91206 phone 818 247-5260, they will send money to Poland for you.
4. Polmar Travel-7525 Mission George Road, San Diego, Ca 92120, phone 619-563-0093
5. Globus Travel 30565 Alta Mesa Dr. , Valley Center, Ca 92082, phone 760-751-2264
7. American Services 5221W. 102ND#106 , Los Angeles, ca 90045, phone 310-628-9990

If you need more agencies in California let me know.
Margaret