I just wanted to post a reply to this message to state that posting on these boards can really pay off! Georg8585 read this thread and reached out to me about birth records for August Bendig and Wilhelm Bendig that he had found in the FHC microfilms for Langenau, West Prussia. He sent me an index page which had the birth records for my great grandmother (Augusta Bendig) and four of her siblings, and now I have ordered the corresponding films. (Thanks Georg!)
It's great to be able to communicate with other people who are studying the same areas/surnames.