I almost sold my iPhone to a shop keeper in the Brussels airport. iPhone is not available in Belgium yet. When I told him I paid an equivalent of 350 euros, he was floored as how "incredibly cheap" this is. After my standard 15 minutes demo, he was ready to pay me 500 euros cash on the spot because if/when they became available, he will not be able to buy one without a contract, like we can just pickup one from an Apple store. He was pleading with me, ignoring all his customers, wouldn't let me leave his kiosk. Almost made me miss my flight.
In the end, I walked away because I had all my pictures from the trip and haven't totally syned up yet. But it was very tempting!