We wore New Balance shoes on our walk across the country. My wife was on her third pair after the 5,000 miles, she got roughly 2,000 miles out of a pair. Usually New Balance have several models of the same general type of shoe and at a shoe outlet store you're bound to find at least one for under $60. I would get an all-terrain model built for stability (models are also built for cushioning or one other attribute I can't recall at the moment). New Balance also has the distinction of once again being made in America.
Disclaimer: I got significantly less mileage. I have pronation that wears out the inside of heels much faster. I "only" got about 1,000 miles per pair.
On edit: Oops. You got me.