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by lovelearning 4244 days ago
There's no dearth of starter kits. Just search for arduino starter kit on Ebay or Sparkfun. They come with an assortment of components like resistors, capacitors, diodes, transistors, 9V battery connector and a few sensors.

Additionally, I bought a couple of the widely available HC-SR04 ultrasonic sensors, a couple of turnigy small servos, an L293 motor driver, couple of L-shaped BO DC motors, and robot chassis. Just search for those terms on ebay.

[1]: https://www.sparkfun.com/products/9065