B&H Photo Video offers the Belkin Wemo Mini Smart Plug, model no. F7C063, for $29.99 with free shipping. (Belkin and Best Buy have it for the same; Amazon has it for the same with free Prime shipping.) That's the lowest total price we could find by $5. It works with Nest devices, IFTTT protocols, and Amazon Alexa, and is compatible with iOS or Android devices.