Here is another robotic arm that combines with Raspberry Pi to teach you a thing or two about robots and coding. The Adeept RaspArm is a WiFi robot arm kit with a Python PC software. You can control it from your PC. Simply bring your Pi 4/3/2B/B+, and you are set.
The robot arm comes with a simple LCD screen and LEDs for status indication. The RaspArm is available for under $80 at this time.