In a modern office environment, it's very common to see people using multiple monitors at the same computer. It's actually fairly easy to set this up for yourself at home, as well. There are a few ...
If you are on a computer and one monitor is already connected, look for another similar port. Make sure your computer or the graphics card supports multiple monitors before buying any equipment.
Take one of these refurbished HP desktops with dual monitors home for $319.99 (reg. $399.99) before they sell out. Inventory is limited and will go fast with this 20% discount.