Here is the $200 Surface Dock for the Surface it ships from MSFT for $14.99 eligible for free 2 day shipping on prime acct.
https://www.amazon.com/gp/product/B00VGJI1RS?tag=hawk-future-20&ascsubtag=UUwpUvbUpU3740095
https://www.amazon.com/gp/product/B00VGJI1RS?tag=hawk-future-20&ascsubtag=UUwpUvbUpU3740095