Go take a look at
this image.
For why I am amused look
The price the poster got must've been something 87 thousand ISK, which according to the way we write stuff in Icelandic was written on the site as 87.800 ISK, or about US$390 according the the exchange rate he writes about in the post. Besides I suspect that the price is for one person, not three as he seems to think, it ludicrously cheap to fly from Boston to Iceland and pay only about $130 per person. And Icelandair is in this business to make money, and I don't think they'd ever sell the seats for $4.
He's visiting the site in Icelandic , not the US site even if he's an American and flying from Boston. Why does he expect that it'll cost almost nothing to fly Boston-Keflavík if he books on the Icelandic site yet it'll cost a few hundred bucks on the US site? The only thing that's changed is the language of the site and the fact that the US site has the prices in USD and carefully avoids using decimal points (commas or whatever).
I wonder if he got furious when the credit card company told him he'd spend $400 rather than $4 on the flight.