Before you go to buy them check out the following link under the section titled,
"Books in Print"
http://en.wikipedia.org/wiki/Vorkosigan_Saga
The thing is that the books have been re-released in omnibus versions. So, for example,
* Miles in Love (February 5, 2008) includes the following three:
o Komarr
o A Civil Campaign
o "Winterfair Gifts"
Therefore, purchasing the omnibus versions will be cheaper. Here is the entire list from wikipedia.
* Cordelia's Honor (June 1, 2000)
o Shards of Honor
o Barrayar
* Young Miles (June 1, 1997)
o The Warrior's Apprentice
o "The Mountains of Mourning"
This short story is also available from the Baen Free Library
o The Vor Game
* Miles, Mystery and Mayhem (August 1, 2003)
o Cetaganda
o Ethan of Athos
o "Labyrinth"
* Miles Errant (September 1, 2002)
o "Borders of Infinity"
o Brothers in Arms
o Mirror Dance
* Memory (October 1, 1997)
* Miles in Love (February 5, 2008)
o Komarr
o A Civil Campaign
o "Winterfair Gifts"
* Miles, Mutants and Microbes (August 1, 2007)
o Falling Free (200 years before Miles's birth)
o "Labyrinth" (also printed in "Miles, Mystery, and Mayhem")
o Diplomatic Immunity