Check out sites like https://www.sparkfun.com/ https://www.sparkfun.com/, http://www.newark.com/ http://www.newark.com/, or https://www.adafruit.com/ https://ww

Check out sites like https://www.sparkfun.com/ https://www.sparkfun.com/, http://www.newark.com/ http://www.newark.com/, or https://www.adafruit.com/ https://www.adafruit.com/ if you're looking to purchase modest amounts of sensors, displays, servos, etc. for hobby projects.