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Costco offers its members the TP-Link Smart Wi-Fi Light Switch with Dimmer 2-Pack for $59.99 with free shipping. (Non-members pay an extra $4.) That's $5 less than our mention from two weeks ago, an all-time best, and the lowest price we could find now by $36. They're compatible with Alexa and Google Assistant and work with dimmable LED or incandescent bulbs. Deal ends December 24.