You can find a genealogist in Poland at www.progenealogy.com or www.apgen.org. Fees vary but will typically be about $75 per hour.
Please reply if you need additional information about this.
Here are some additional contacts:
Each genealogist is generally self-employed and will state their fees. Most will also usually require a retainer equivalent to several hours' work prior to beginning.
Just checking to see if you need additional information on your question. If not, I would appreciate a positive rating (I strive for all "5s") so that I get paid for my work.