Coastal Scents Pro Blending Fluff Brush ($4.95, coastalscents.com) Professional makeup artists use a blending brush like this one to diffuse a smoky eye. This under-$5 version is comparable to brushes that cost four times as much.
Sonia Kashuk Large Angled Contour Brush ($9.99, target.com) To define your facial features, try an angled brush like this one. Its shape works great in the hollows of the cheeks and around the forehead.
B-Leve B-Complete 5-Piece Cosmetic Brush Set ($19.99, b-leve.com) If you're just learning about makeup application (or need an extra set to travel), start here. This kit includes a powder brush, three eye shadow brushes, and a comb.