Be sure to check out Monoprice. This is more of a public service announcement than anything else because I've had great success buying from them. The prices are great and the gear is solid. I first heard about them a few years back when I needed some HDMI cables (which they're now famous for) and didn't want to spend a ton of money at Best Buy for the exact same thing. I think I paid $6 when they wanted $50 at BB for the exact same cable.
Last week I picked up a 27" IPS-ZERO-G Slim Monitor from Monoprice which is the exact same screen my 27" iMac has at the office. Apple buys these screens from the same manufacturer. It's a beautiful display and I wanted the real estate on my desk at home to match what I have at work. This is also the exact same screen Apple sells for $899 as a standalone unit, but I only paid $390. It's a great screen. There were zero dead pixels. Granted, it doesn't have all the bells and whistles the Apple screen has like the built-in camera and extra ports, but I am OK with that. I also picked up a VESA desk mount to get the screen up off the table and free up some table space for a whopping $17.
They have tons of other great stuff besides cables and monitors. Things like waterproof action cameras, speaker cable, surround sound systems, guitars, headphones, podcasting microphones, iPhone cases, and lots more. Check them out and see what you can come up with.
Also check out The Wirecutter for their reviews if you don't know what to get. They are the best in the business.
And finally, if you're going to hook up your new screen to a Mac mini or a MacBook Pro, be sure to get one of these adapters from NewEgg for under $30 instead of the $99 Apple charges. Yes, get that exact one, otherwise you'll top out at 1920 pixels wide on your display instead of the full 2560 pixels.