How to buy a county-owned property?

[Teresa DelaMater]

I recently drove past a house that appears abandoned, and when I looked it up on the appraisal district website, it shows that it has been owned by the county for the last 7 years. There is a small amount of back taxes owed on it as well. How would I go about making an offer on this house? To my knowledge, it's not scheduled to be auctioned. And what is common for a purchase price for something like that? Would I just need to pay the taxes owed? Or market value? Somewhere in between? Thanks!