TopTopMall via eBay offers this Bluetooth LED Smartbulb with Speaker, model no. TS-D03, for $16.52 plus 99 cents for shipping. That's the $2 under the lowest total price we could find for a similar smart bulb elsewhere. It features compatibility with most Android and iOS devices, Bluetooth 4.0, E27 screw base, and range of up to 33 feet.

Note: It ships from mainland China and may take two to four weeks to arrive.