Costco $179.99, Price valid through 2/25/18.
Chromecast Built In
Wi-Fi and Bluetooth Enabled for Wireless Streaming
Two Rear Speakers and Wireless Subwoofer.
The subwoofer is wireless from the soundbar, the 2 surrounded speakers are wired to the subwoofer, usually behind you.
Optical and Analog Inputs
Includes HDMI and Optical Cables
I have seen this being sold in the Costco stores this week.
This version is much better than the bluetooth only versions are often on sale at Walmart. This speaker system can be casted to via Android/iOS/Chrome, and be placed in a google home speaker group.
Bestbuy has it on sale too, but for a higher price. $219.99 , unknown date of expiration.
If you don't have a Costco membership, it would still be cheaper to buy it from Costco and pay the non-membership fee.
Updates to questions:
4K pass through is support can not be verified. Vizio support on Best buy said it is supported, but a user here says it isn't.
HDR10 and Dolby Vision are NOT supported. So use ARC (audio return channel), this is where the sound comes from the tv over HDMI.
Without HDR10/DV HDR, you do not want to use the pass through at all, use ARC.
Here is the product on Vizio's site. https://www.vizio.com/sb3651e6.html