We see deals on USB-A to USB-C cables with some regularity, but deals on C-to-C cables, which are necessary for faster USB-C Power Delivery charging speeds, are less common. Today though, you can save on Anker’s nylon-wrapped PowerLine+ versions of both.
Both cables are $8 today with promo code ANKER333, and available in both gray and red, but note that the A-to-C cables are 6' long, while the C-to-Cs are 3' long, though they also include a carrying pouch to avoid tangles.