Ocean Technology via Amazon offers the Unitek USB Type-C Male to USB 3.0 Type-A, Female 8" Charge and Data Sync Cable, model no. Y-C476BK, for $7.49. Coupon code "R7C8RPH3" cuts that to $3. Plus, Prime members bag free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $8.) That's $17 off list and the lowest total price we could find. It lets you connect a flash drive, keyboard, mouse, or other standard USB-A device to a USB-C enabled device.