TechMatte is currently offering its USB Type-C cables for as little as $6 at Amazon with a coupon code, a savings of $3 on either length. You can grab the 3 foot cable for $6 with coupon code X63CJZ9D or go for the 5 footer for just $1 more, at $7 with code 4N4GQVAL. These two cables have a number of good reviews, including positive remarks from Google's Benson Leung, who recently reviewed a number of USB Type-C cables to ensure they were safe to use with your phones.
If you are in need of an extra cable or two for your new phone, you'll want to hit the links below. Remember, for the 3 foot version you want to use coupon code X63CJZ9D, and for the 5 foot one you need to use 4N4GQVAL.