Dell has the Vizio M-Series Quantum M557-G0 55" 4K Ultra HD HDR Smart Quantum Dot LED TV (2019 model) for $550 with free shipping. Includes a $150 Dell gift card with purchase (emailed in 10 to 20 days).

3840 x 2160 (4K UHD), HDR10, Dolby Vision, Hybrid Log Gamma

Built-in Chromecast/AirPlay 2, Alexa/Google Assistant/Siri compatible

Full Array Local Dimming, Octa-core processor, SmartCast OS 3.0, 4 x HDMI

The Vizio M558-G1 55" 4K HDR Smart Quantum Dot LED TV (2019) is $600 shipped with a $200 Dell gift card.

Note: The M558 has 90 local dimming zones vs. 16 on the lower-priced M557 above.