News / Adoption from Poland for a 50% Polish? [10]

My husband and I are American, but my mother is ethnically 100% Polish, making me 50% Polish. We would like to adopt a child, and would love for he or she to be Polish, since we have a deep respect for and love of Polish culture. We are new to adoption, and are looking for a reputable American agency to handle a Polish adoption. I can only find one agency - St. Mary's. Does anyone have any advice about how to proceed? Thank you.