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BR30 LED Bulbs, Works with Amazon Echo and Echo Dot, App Controlled, Connect Up To 8 Bulbs, Pearl White [White, Master+Satellite Pair]
Click 30% off coupon on product page, discount applied at checkout. Appears to apply to all color choices, but only for the master + satellite system.
Note that you can only control the speakers, not the lights, with Amazon Echo. Lights and dimming must be controlled through Sengled app.