X-Chair X1 Flex Mesh Task Chair for $640 ($50 off)
This is a small discount, but this is one of my favorite chairs. The mesh fabric manages heat very well, so you never feel too hot or sweaty sitting in it. There’s lumbar support that shifts as your body moves so it’s always supporting your back, and the arm rests are quite adjustable. You can add a headrest, but I recommend skipping it to save money.
LG 34UM69G-B 34-Inch HD Ultrawide for $330 ($50 off)
Trust me, you need an ultrawide. It gives you a lot more room for multitasking. I can have a spreadsheet on one side of the screen and a Chrome tab on the right to reference something else. Or two Chrome tabs side by side. This one from LG has a 2,560 x 1,080 pixel resolution, is VESA mountable if you want to put it on a monitor mount, and uses an IPS panel for nice colors and good viewing angles.
Dell UltraSharp 27-Inch Monitor for $360 ($140 off)
This Dell isn’t as big as the ultrawide, but the 27-inch screen is still large compared to most traditional monitors. You get a slim profile, a sharper 1440 pixel resolution, plus VESA mounting support. There are multiple DisplayPort and HDMI ports, and you can even swivel it into a portrait orientation in case you want to use it as a second monitor.