I can get it for cost.

5 seconds sound clip from the Miracle on 34th Street (1947) movie soundboard.

You can hear this line at 00:49:24 in the Blu-ray version of the movie.

Quote context

[...]

- I didn't think you were that generous. That's a bit of money. What are you going to do with it?

- Well, I have a friend-a doctor. He's been very kind to me. He needs an X-ray machine.

- Oh, I don't think that's going to be enough. I better give you...

- I'll make up the difference.

- Buy it through the store and get 10 percent discount.

- I can get it for cost.

(All Laughing)

- Good night, Susan.

- Good night, Cleo.

- Would you like me to sing you a little good-night song?

[...]