From your other post: "but we don't live in a city or an area many people desire to move to". If you are posting here because you live in Columbia, it's actually more desirable than you think for a lot of folks.

If you offer a massive discount like rent the other half at $750 you can likely get a roommate fairly quickly. I suggest finding the forums/listing boards for the local community college, hospital, and armed forces bases and posting there to see if there's any interest.