There is a Robotic Arm Kit you can buy for less than 60 USD. This should get your attention...
At Maker Shed, they have this Robotic Arm Kit "Edge".
With that (text copied from product description), you command the gripper to open and close, and control wrist motion of 120 degrees, an extensive elbow range of 300°, base rotation of 270°, base motion of 180°, vertical reach of 15", horizontal reach of 12.6", and lifting capacity of 100g. Added features include a search light design on the gripper and a safety gear audible indicator on all 5 gearboxes to prevent any potential injury or gear breakage during operation. Award-winning kit assembles with simple hand tools. Ages 10 and up.