Hamad, 34, has shopped at Wal-Mart before, but never one like this. She is overcome with nostalgia as she spots Nido powdered milk and Al Haloub Cow, canned meat she calls the "Arabic Spam." "My father loves this," she says. "People from war-torn countries, this is what you lived on when you couldn't go out of the house to shop." This Wal-Mart, though, isn't in a war zone. It's in Dearborn, Mich., home to nearly a half-million Arab-Americans, the largest concentration of Arabs outside the Middle East.