Assuming your computer can handle it, a 4K monitor is one of the best upgrades you can make to your computing experience, and it’s never been cheaper than it is today on Amazon.
For one day only (or until sold out), you can get a refurbished Samsung 28" 4K display for just $270. That’s one of the first times we’ve seen a 60Hz 4K display drop below $300. The same monitor is currently listed for $400 new, and while the refurb only includes a 90 day warranty, you can add three years of protection for about $20 (look above the buy button on Amazon).