Mark W. sends a heads-up that the 1914 Prairie School house at 738 William Street in River Forest, IL is for sale for $629,900. The 700 block of William Street is known as a rare example of a large planned concentration of Prairie homes and also for having a murky pedigree. The established architect of record is Harry F. Robinson, but there are some that would like to add the homes to Frank Lloyd Wright's resume (though actual, empirical proof seems elusive). See the listing here.
Image via redfin.com