Season 7, Episode 24: "The Invitations"

I don't know, what about this one?

To tell you the truth, they haven't made those for a number of years.

I might have some boxes in our warehouse in New Jersey.

-I'd have to check. -Oh, no. George, that's so ugly.

We don't want that.

What's the difference? You just read it and mail it right back.

-These ones. -Why don't they make them anymore?

Well, for one thing, the glue isn't very adhesive.