Gosh $4 per transaction!
I'm a transplated to the U.S. aussie and I
used to laugh at the U.S.'s fascination and
utter commitment to capitalism/competition, but there
are some upsides. I've never been charged
an overseas transaction charge on any of
my US credit cards and I've been to all
continents except Antartica!
However, using an ATM will give you
a better rate and no surprise fees
when compared to changing money at
a hotel/airport. What-ever you do,
don't get suckered in by people at LAX
who will offer to change money for you
because they are going to the country
your from!