Woot offers OtterBox USB-C 30W Charger + OtterBox 1M USB-C Cable for $9.99 (reg $39.95). Free shipping for Prime Members.  

Product Description:
USB-C to USB-C cable and 30W USB-C Wall Charger Kit is powered by GaN technology, giving you higher efficiency by generating less heat in a small form factor that delivers maximum power. The Fast Charge Cable is bend/flex-tested 3,000 times for long-lasting use and supports both USB Power Delivery and PPS technology.