Amazon currently has Dell's popular 27-inch 4K Monitor on sale for just $399. This is down from its original price of $699, making it a great deal, and also bringing it down to its lowest price all-time. This monitor is going to make a great addition to any workstation, whether you have a home office, or not.
This monitor from Dell is a regular 16:9 aspect ratio display, and not a wide-screen monitor. It does also do 4K resolution, but it's not part of its Infinity Edge monitors, so there are some sizable bezels here, but that shouldn't make a huge difference. It is mountable, as it is compatible with VESA mounts. Additionally, Dell has added a slew of ports on the back. Including a HDMI port, a VGA port and a slew of USB-A ports. So if you are in need of some extra USB ports, this might be the monitor to pick up.
This item is also eligible for Amazon Prime's free shipping. Which includes free two-day shipping, and pretty cheap (usually $3.99) next-day shipping if you need it extra fast. If you are not an Amazon Prime member yet, you can sign up for a free trial of Amazon Prime. You'll get 30 days free (if you're a student, you get 6 months), and then it's $99/year (or $49/year for students). Prime members do get a whole lot more than just free shipping though, so be sure to check out the full benefits.