The owners of that site most likely buy their product in Europe, and they are more expensive here in all countries, so you have to convert from €. I can't of any American lifestyle company that is cheap in Europe. Vans f.e.: In California, I paid $70 incl. tax. Here in Germany it's € 95 (about $147) for the same shoe.
Of course the price difference is huge for Oakley now, but they were about the same in $/€ when the € was introduced. They prices themselves have not changed dramatically in the past years, it's just the exchange rates.