Understanding pricing on a tax sale property

[Charlie Koonce]

I have found a property online that was foreclosed on because of unpaid taxes. The online price is $13000+, but when I looked up the in-arrears taxes owed, this was about $23,000.  I will go to the tax office when they open next and ask them.  There is no realtor's name or "seller's" name on the website, so to find out more, I guess should I talk to a realtor as well?   My real question is:  Would the price to actually get the house be the $13000+ plus the in-arrears taxes of $23000+, or a total of about $36000?  Any thoughts?