My mill came (second hand) with the scales already installed. The previous owner had a Shumatec DRO installed but kept the DRO for his new mill. I got involved with the Shumatec Group and bought the board, housing, and components and assembled my DRO myself. Love it!
If you got the Shumatec DRO, you would still need to buy the scales seperatly. The group had a deal going on Igaging scales last I heard.
Chuck