Belkin's latest Wemo light switches work natively with HomeKit
Amazon.com: Wemo Smart Light Switch with Thread - Smart Switch for Apple HomeKit - 3 Way Switch Compatible - Smart Home Devices - HomeKit Light Switch - Apple Home - Requires Neutral
Belkin's popular WeMo Light Switch gets a 50% price cut to $25 shipped
Amazon.com: WeMo Smart Light Switch 2ND Gen : Everything Else