Works with Samsung SmartThings, Wink, etc.
No proprietary hub required.
Lowest price on CCC and an overall great deal. (High was $26, average ~$20)
This is even cheaper separately than the 6 pack current price.
Tax/shipping cost may depending on State/Prime membership, etc. Mine was $0.75 per bulb which I got back $1 digital credit for.
(Are there any states that are still tax free from Amazon directly?)