Someone I met today worked at DFS in the Keflavík Airport.

Something interesting about the Keflavík is that it used to be the base of operations for the US military. It explains why it's so removed from Reyjavík. Anyway, when buying SIM cards for our phones at the airport (NOVA was what we got), I was ringing out our snacks with the guy when the card machine flashed.

ISK or USD?

"Yeah... It can be confusing sometimes."

The cashier chuckled. He noted it happened a lot with tourists. He seemed really pleasant and didn't seem like he minded being there at all. I've heard Icelandic people are nice, and this was a good start.