GearBest offers the Yeelight 28-watt Smart LED Ceiling Light for $74.99. Coupon code "3RDGBYS" cuts it to $69.99. With $5.19 for shipping, that's the lowest total price we could find by $45. It can be operated remotely via a smartphone and also works with IFTTT and Amazon Alexa.
Note: This item ships from mainland China and is expected to arrive in 15 to 30 business days.