Unifun via Amazon offers Prime members the Unifun 12-watt LED RGB Color-Changing Bulb for $9.99. Coupon code "BMVM3JT8" drops it to $7.99. Plus, Prime members bag free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $6.65.) That's $20 off list and the lowest total price we could find. It features 16 different colors, four modes, and includes a remote control. Deal ends September 30.