There was a picture of a Roman fruit market where a vendor was selling esrogim. I believe the price was $5 for one. Even putting in some hashgacho markup, I’m not sure how esrogim can be that expensive.
BUT, I think we might be our own worst enemy. If somebody were to sell an esrog for $25, many wouldn’t buy it, “obviously there’s something wrong with it.” So they sell it for more.