Hi Josh, For simple things such as connection wires then try Amazon, Ebay, Banggood or Tmart. Just watch out for the delivery time for free postage items. Free delivery from China can be three to four weeks! You don't say what type of sensors you want to use in your projects. Items from China can come with little or no documentation, whilst this fine if you know how to connect and use the item, for a first time use of a sensor I would look to one of the larger on-line companies such as Element14, Hobbytronics, Pololu, or Adafruit. Most of these companies, and others too numerous to mention, provide a wealth of information and code samples to go along with their sensors. Also you can try your high street electronics shops such as Radio Shack in the U.S.A and Maplins in the U.K. As I don't know where you live I can not be more helpful.Try responding with the name of the country that you live in and possible someone from there will be able to help you. This is the power of a Forum.
Hi Gina, I don't think that the STEM People sell individual items from the Pi-Bot kits, also I don't believe that Tamiya, the people that produced the motor gearbox kit sell the gears separately. You will need to buy a complete motor and gearbox kit. try "googeling" tamiya 70168 double gearbox kit and you should get some results from inside your country, from Amazon, Ebay or other model shops. What you don't say is why you need the new gears, Do you have a problem with the Pi-Bot? Being oily, is not necessarily a problem, gearboxes need lubrication to reduce wear. Let s know if you need any help.
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