Still Searching for Husband's BP's, born 3-22-1971

I am still searching for my husband's birth parents. The only information I have is that he was born 3-22-1971 at Duncan Memorial Hospital, delivered by Dr. R. L. Pearce at 4:26AM. His birth mother was 16 years old and his birth father was 21 years old. The only other info I have are there height, weight, eye color and nationality, they were both white. This is pretty much all we have to go on, we have contacted the Gladney Center, but at this time we just cannot afford the fees they are asking for, with no guarantee of being able to give us their names. Can anyone out there help me in my search?? Thank You!!