Oh, you mean the Ghostbusters hot-beverage thermal mug and free balloons for the kids?
7 seconds sound clip from the Ghostbusters II movie soundboard.
You can hear this line at 00:39:00 in the Blu-ray version of the movie.
Quote context
[...]
- I ain't, I ain't, I ain't afraid of no ghost.
- With our special half-price service plan.
- What? Hold on. Half-price? Have we all gone mad?
- I guess so, Pete. Because that's not all.
- Oh, you mean the Ghostbusters hot-beverage thermal mug and free balloons for the kids?
- We've been experimenting with the plasm we found in the subway tunnel.
- Careful.
[...]