Man: Hi, Jane.
Woman: Hi, Mario.
Man: How do you like my bookcase?
Woman: Oh… it’s a…
Man: It was a real bargain. I got it at a fantastic price.
Woman: How bad.
Man: Tell you what, I’ll sell it to you for ten percent off.
Woman: Oh, no, no, no thanks.
Man: I’ll give it to you for fifteen percent off.
Woman: Mario, no, I don’t want this bookcase.
Man: Jane, this is a bird of a deal, cheap, cheap, cheap. It’s priceless.
Woman: Mario, I think you’re priceless.
Man: Hah, buying furniture, it’s fun, if the price is right.
What does “this is a bird of a deal” mean in this dialogue?
Does it mean “gratuitous, free , gratis, steal”?
Thank you