"Scale" propellers are usually a waste of money if you're looking for a flying prop. For flight, use a propeller that will allow the engine to turn in its proper RPM range and still allow the model to fly correctly. Make a scale display propeller for when you're not flying. The main reason is that a scale propeller on most models would be nowhere near the correct diameter and pitch for the engine you'll be using. Also, some scale aircraft have three- or four-bladed props, which are not particularly efficient at our sizes...go with a 2-blade prop for flying.

For a good-quality scale propeller, you'll actually have to hand-carve one, unless somebody already makes one that suits your airplane. This would be a non-flying propeller, of course.