There are several rods that would work in that price range. TFO. ECHO, Redington, St. Croix, and Lamiglass all have rods that fit your criteria. One of the best values is the Redington RedFly combo that comes complete with rod, reel, line, and backing. All these rod manufacturers have good casting rods for under $100.00.
Although from your description of what he will be using it for, I'd be more inclined to look at getting a 5 wt, unless he is also going to use the rod for bass fishing.