I was born in Los Angeles on July 27, 1969. My name now is Michael Robert Wuttke. I was adopted in San Bernardino on September 9, 1969 (I think). Can anybody tell me how to find my biological parents, at least their names, without spending thousands of dollars?

Have you asked your parents who adopted you for the information they may know ?

Here is also a link which provides very good information on conducting adoption searches.