Flat Fee MLS vs. For Sale By Owner. Flat Fee MLS options. How does this Flat Fee MLS option work? Three ways to sell your property. What is included with my $495.00 Flat Fee MLS option? Additional Options? When and how do I pay the $495.00? What if I want more options or change my mind on how I want to sell my property? How do I get started? What if I have other questions?