The Theodore Pappas House in St. Louis is for sale. The house, a Usonian Automatic originally designed in the mid-1950s for an employee of the St. Louis Browns. The house was completed in 1964.
The house is being sold off-market, so there's no website. You can see the floor plan and B&W photos of the house taken in the 1970s in the property's application for inclusion in the National Resistration of Historic Places and there are a few more current photos availiable through a Google Image search
If you are interested in purchasing the house, you can contact firstname.lastname@example.org.