"This omnibus series is the ultimate compilation of Dark Horse's original Buffy comics and runs chronologically along the TV series' timeline"--Back cover.
v. 7. Reprints Buffy the Vampire Slayer #39-42 ; Buffy the Vampire Slayer: Chaos bleeds ; Buffy the Vampire Slayer: Lost and found ; Buffy the Vampire Slayer #43-45 ; Dark Horse extra: Buffy the Vampire Slayer "Spike in 'Rock 'n' Roll All Night (And Sleep Every Day)'" ; Buffy the Vampire Slayer: Willow and Tara "Wilderness" ; Buffy the Vampire Slayer: Reunion ; Buffy the Vampire Slayer #46, 47-50.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Buffy the Vampire Slayer omnibus. ISBN 9781595823311. Published by Dark Horse Books in 2008. Publication and catalogue information, links to buy online and reader comments.
