Why not?
3 seconds sound clip from the The Searchers (1956) movie soundboard.
You can hear this line at 01:19:57 in the Blu-ray version of the movie.
Quote context
[...]
- Salud!
- El mejor tabaco del mundo, senor.
- Let's talk a little business.
- Why not?
- While you're fillin' your belly, I'm goin' out to meet a Comanche named Cicatriz.
- Cicatriz is Mexican for scar.
[...]