The Off brand should be available in most stores. It's been my aerosol repellent of choice for years. I'm also partial to Mosquito Milk, a roll-on repellent.
If she chooses to buy at home, aerosol repellent up to 17oz may be packed in checked bags, and up to 3.4oz in a carryon bag at a TSA checkpoint.
http://www.faa.gov/about/initiatives/hazmat_safety/No matter what she picks, the best repellent is the one that she remembers to use.
