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Originally Posted by jeffmorris
I want to buy optical shaft encoder and ultrasonic range finder but Radio Shack and Vex Robotics don't have them anymore (I think). Are there other sources?
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VexLabs now carries all of the Vex components. Here are the links to the Ultrasonic and Optical Shaft Encoder pages. They are currently sold out of both the Ultrasonic and Encoder Sensors, which may also be the reason why you cannot find them at RadioShack. If you can wait a few weeks, they will most likely be in stock again.
Ultrasonic Range Finder -
http://www.vexlabs.com/vex-robotics-...oder-kit.shtml
Optical Shaft Encoder -
http://www.vexlabs.com/vex-robotics-...nder-kit.shtml