This TP-Link KL130 Kasa Multicolor Smart Light Bulb drops from $29.99 to $16.99 to $14.99 at Amazon after you check the $2 off coupon box below the price. Shipping is free with a Prime account, with a free Prime trial, or on orders over $25. Otherwise, it adds $5.99. That's the best price we found by $13. This dimmable smart bulb can display a range of millions of colors and can be controlled using an Amazon Echo, Google Home, or the Kasa smartphone app. No hub is required. Sales tax is charged in most states.