Presidents' Day TV sales you can still get — here's the 5 deals I'd buy

Insignia 43" F30 4K Fire TV: was $239 now $179 @ Amazon
The Insignia F30 is one of the cheapest 4K TV deals you can get. It features HDR10 support, DTS Studio sound, and a voice remote with Alexa built-in. It's not always on sale, but right now you can get it a fraction of its normal price. 

Onn 50" 4K Roku TV: was $248 now $198 @ Walmart
Walmart has its Onn 50-inch 4K Roku TV on sale for $198. The TV features HDR10 support, Dolby Audio, Apple Home/Amazon Alexa/Google Home compatibility and voice controls via the Roku mobile app. Plus, it uses Roku's excellent software to bring you hundreds of streaming apps. It's not the TV we'd recommend if you're looking for top-notch performance, but if you're on a strict budget, it doesn't get much cheaper than this. 

TCL 55" Q5 4K QLED TV: was $449 now $279 @ Best Buy
The new TCL Q5 4K QLED TV is a budget TV with plenty of great features. It offers Dolby Vision/HDR10+/HDR10/HLG support, DTS Virtual: X audio, built-in Chromecast, and Amazon Alexa/Google Assistant compatibility. Although the display is just 60Hz natively, Game Accelerator 120 allows for 120Hz VRR at a lower resolution. You also get a bright QLED display for well under $500. This model is a Best Buy exclusive.

Roku TV 55" Plus Series 4K QLED TV: was $499 now $449 @ Amazon
Editor's Choice! The Roku Plus Series is an outstanding value. In our Roku Plus Series 4K QLED TV review, we said it offers a great smart interface, HDR color, and excellent sound at an affordable price. It features a QLED screen along with full array local dimming. You also get Dolby Vision/HDR 10 Plus/HLG support, Apple HomeKit/Alexa/Google Assistant support, and four HDMI ports. Gamers take note that while it's reliable for casual play, you only get a 60Hz screen and no HDMI 2.1 support. 
Price check: $449 @ Best Buy

Hisense 55” U8K Mini-LED 4K TV: was $1,099 now $748 @ Amazon
If you want a new TV and don't want to overspend, the Hisense U8K Mini-LED TV packs a ton of premium features into a mid-ranged price tag. It offers a Mini-LED panel with a high peak brightness, beautiful contrast and colors, and support for a 144Hz refresh rate, VRR, ALLM and AMD FreeSync Premium Pro. It comes with an ATSC 3.0 tuner and support for IMAX Enhanced, HDR 10+, Dolby Vision and Dolby Atmos. We rank it as the best TV on the market right now.
Price check: $749 @ Best Buy

LG C3 4K OLED TV sale: deals from $821 @ Amazon
If there's only one deal you see today, let this be it. Amazon has all sizes of the Editor's Choice LG C3 on sale at their lowest price ever. Not only that, but it's beating competitors like Best Buy and Walmart by as much $401 on some sizes. The LG C3 is one of the best mid-tier OLED TVs you can buy. In our LG OLED C3 review, we said the Editor's Choice TV delivers perfect blacks, thrilling contrast, and rich, accurate colors at every point across the visual spectrum. It's also perfect for gamers with a suite of Game Optimizer features and a 120Hz refresh rate. It offers Dolby Vision/HDR 10/HLG support, four HDMI 2.1 ports, built-in Amazon Alexa, Google Assistant/Apple HomeKit support, and LG's Magic Remote. You're not going to see these prices again for a long time.
48" for $914 [new price low]
55" for $1,249
65" for $1,479 [new price low]
77" for $2,296
83" for $3,579 [new price low]

Samsung 65” QN90C QLED 4K TV: was $2,799 now $1,597 @ Amazon
The Samsung QN90C Neo QLED offers best-in-class HDR brightness and excellent overall performance. This TV has HDR10, HDR10+ and HLG support, a 120Hz refresh rate and 4 HDMI ports (two are HDMI 2.1 ports). Also included are Amazon Alexa, Google Assistant and SmartThings integration. In our Samsung QN90C QLED review, we said "this is the QLED TV to beat this year."
Price check: $1,599 @ Best Buy