Can you name the works you'd collected? That's a killer lineup, I'm a huge fan of Walter Jon Willams and have enjoyed what Watts I've read.
> A Dry, Quiet War by Tony Daniel
> ZeroS by Peter Watts
> A Soldier of the City by David Moles
> The Beast Adjoins by Ted Kosmatka
> Lady Be Good by Jack Campbell
> Mid-Death by Alan Dean Foster
> Weaponized Math by Jonathan Brazee
> Prayers on the Wind by Walter Jon Williams
> Highwaymen by Ken MacLeod
> Second Skin by Paul McAuley
> The Dread And Fear of Kings by Richard Paul Russo
> Herbig-Haro by Harry Turtledove
> The Lost Dorsai by Gordon Dickson
> Cincinnatus by Joel Rosenberg
> The Proud Foot of the Conqueror by Reginald Bretnor
It's the stories lower on the list that were unobtainable. Dickson, Rosenberg, and Bretnor being dead (may they all rest in peace,) did not help matters.