If you are buying or have bought a new USB C type device eg Nexus 5X or Nexus 6P, you might want a few spares and especially USB C to USB A. Well below is a link to some that I have found on Amazon at reasonable pricing.

USB Type C Cable, Rankie® Hi-speed Micro USB 3.1 Type C to Standard Type A USB 3.0 Data Cable for Apple New Macbook 12 Inch, Nokia N1, Tablet, Mobile Phone and Other Type-C Supported Devices 3.3ft/1m