The new Lutron Caséta Diva smart dimmer switch doesn't require a neutral wire - The Verge
Lutron Diva Smart Dimmer Switch Starter Kit for Caseta Smart Lighting, with Smart Hub + Pico Remote, 150-Watt LED (DVRF-BDG-1D) DVRF-BDG-1D - The Home Depot
Lutron Diva Smart Dimmer Switch with Wallplate for Caséta Smart Lighting, White - Walmart.com