4 Pack SYLVANIA 74768 Smart (Formerly LIGHTIFY) Dimable, 60W Equivalent A19, 10 Year, Works with Amazon Echo PLUS, SmartThings and Wink (4 Pack) Soft White 2700K $11.50

Fifty cents cheaper than the previous post and from a more reliable seller.
1st – You need a hub: SmartThings, Echo PLUS, Wink 2 or other compatible ZigBee hub. If you don’t know if your’s is compatible, Google your "hub and ZigBee"
2nd – If you don’t have a hub this site and try to find a deal on an ADT SmartThings hub, regular Smarthings hub or search Amazon for this starter kit ( SYLVANIA 71932 SW Zigbee Starter Kit ). It is the same bulb but it includes a hub, but your better off just buying a SmartThings hub as it is more universal.
https://www.amazon.com/Sylvania-S…07576J38L/