retail: $480
$350
Amazon has the Toshiba Fire TV Edition 55" 4K Ultra HD HDR Smart LED TV, 2018 model (55LF621U19) for $350 with free shipping. Works with Alexa when paired with an Amazon Echo device. Same price at Best Buy.
The 43" model is (43LF621U19) is on sale for $200 (also Best Buy), and the 50" model (50LF621U19) is on sale for $280 (also Best Buy).
3840 x 2160 (4K UHD), 60Hz refresh rate, quad-core CPU Built-in Fire TV, Voice remote w/ Alexa, Wi-Fi/Ethernet, 3 x HDMI
The 43" model is (43LF621U19) is on sale for $200 (also Best Buy), and the 50" model (50LF621U19) is on sale for $280 (also Best Buy).