I don't know if this is new to you but webscription.net is part of Baen Books.
Go to
http://www.webscription.net/s-88-fred-saberhagen.aspx for;
W200502 February 2005 WebScription $15.00
Against the Tide
Moonstruck
Berserker Death
Cosmic Tales: Adventures in Far Futures
This Scepter'd Isle
Forge of the Titans
Or
W200606 June 2006 WebScription $15.00
Blackcollar: The Judas Solution
From Dream to Dream
The Cobra Trilogy
The World Turned Upside Down
Rogue Berserker
Rocheworld
The Reality Matrix
And others ofcourse.
Berserker Throne by Fred Saberhagen is in
Baen Books Free Library..