Check out Triplett Harps in San Luis Obispo. They make a travel harp (Zephyr) that is small enough to take on airplanes as carry-on, but still very playable and extremely well built.

They also make a lap harp (Christina model) that is lightweight, but still has a decent range and wonderful tone.

They make full size harps too. I've owned several harps over the years from different makers, but I think Tripletts are the best.