I recently upgraded to the Brooks Cascadia 6, so my used Cascadia 5's are no longer needed. They have around 200 miles on them, but are still in good shape. Still a lot of tread on the soles. They should be good for another few hundred miles. The stock inserts were removed, but they will come with a generic white insert that is not much different from the original.
Size: Men's US 11.5 (I would say they fit more like an 11)
Price: $20 shipped CONUS