A bargain at several times the price
Violin runs, especially doubled by a harp gliss: everyone’s favorite orchestration trick (à la Jerry Goldsmith), with only the possible exception of flutter-tongued brass doubled by ratchet (Ravel).
The first one’s free from VSL (Vienna Symphonic Library), in the hope that you’ll like them and come back for more. These are Austrian string runs, but they’re not only for waltzes and Arnold Schwarzenegger.
Price: If you have to ask, you can’t afford it.