DyannLynn, my patients find Colorescience Sunforgettable SPF mineral powder sunscreen very useful for oil control. It is available from the offices of dermatologists or other doctors who have a special interest in medical skincare. It comes in a portable tube with a built-in brush so that it's easy to tote around, even as carry-on baggage on an airplane, and can be reapplied quickly. Besides controlling oil, it's also a chemical-free sunscreen that is recommended by the Skin Cancer Foundation. It comes in different shades to match your skin and also as a translucent, colorless powder.
Hope this helps!
Dr. Hema