From tiny aircraft that fit in the palm of your hand to commercial vehicles used to inspect power lines, the number and kinds of drones available for purchase are growing fast. Prices for smaller models are down to $40. But it’s easy to spend thousands of dollars on high-end models. Consumer models focus on basic flight and photography applications. Heavier duty devices are beginning to be used for commercial deliveries. Select a drone type below to find out more about each category of the newest flying machines.