Z-Wave Products via Amazon offers Prime members the Philips Hue Personal Wireless Lighting Single A19 Bulb, model no. 426361, for $39.99 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $6.69.) That's the lowest total price we could find by $18. It features wireless smartphone and tablet controls when paired with the Hue starter pack.