Cape Ava's device is the cheap OSRS gold best option since it can greatly increase your ranged stats, and also gain some of your bolts, arrows, and other weapons. It is possible to unlock it by completing the Animal Magnetism quest. Prior to reaching 50 Ranged, you'll get Ava's Attractor which can be upgraded by Ava NPC and upgraded to the Accumulator. When you have completed Dragonslayer 2...