So far only 2.
The movie version was played by Kristy Swanson and the Television version was played by Sarah Michelle Gellar.
Although there are talks of a new movie so it could soon be 3....
She didn't.
Blackout - Buffy novel - has 256 pages.
Crossings - Buffy novel - has 243 pages.
Seven Seasons of Buffy has 240 pages.
Paleo - Buffy novel - has 257 pages.
Oz.
Scooby Doo The Movies
Carnival of Souls - Buffy novel - has 320 pages.
Unnatural Selection - Buffy novel - has 210 pages.
Here Be Monsters - Buffy novel - has 178 pages.
Dark Congress - Buffy novel - has 256 pages.
Prime Evil - Buffy novel - has 260 pages.