A quick joke, the rebuttal

So the husband says, "I had a dream like that, too. I dreamed I was in this huge place, and they were auctioning vaginas."
"Really," said the wife.
"Yeah, they had old vaginas on auction starting at $2.00, and young ones started at $100."
"So how much did one like mine go for," asked the wife, expecting her husband to say "free."
"Yours? That's where they held the auction."