Adapter from USB C device to USB port
You're looking for a USB-A to USB-C cable.

Example: 3.1 USB-A to USB-C™ Cable (Also Known as USB Type-C™)  from Belkin

It's $29.99 USD, however I'm sure you can use a search engine to find a better deal, e.g.:


Google search - 3.1 USB-A to USB-C cable
Google search - 2.0 USB-A to USB-C cable