I'd second the Photobackpacker cases as being excellent for the price. I'd get what you need from there and then figure out what kind of bag, case or box to fit them in.
One of the rolling suitcases would be good for moving them around and providing a little more protection as well.
Along the same lines, but probably pricier, would be one of the wheeled Pelican cases. I see those rolling through Manhattan all the time.