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.
One grocery chain is likely to save you more money than any other.