hardware for dual monitors

I have a DELL Optiplex PC, running windows 7 pro, that only has one VGA port, from the video card.  I wanted to see if anyone could recommend an external piece of hardware that I could use, to make it possible to have dual monitors (dual video display).  I am looking for an external device, rather than a new internal video card.  Please let me know.
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If you want the same (cloned) display on both monitors, just use a VGA "Y" cable. If you, on the other hand, want to extend the displays, I'd really rather recommend an another internal GPU, that is much cheaper and usually performs better than anything external connected to USB ports. Besides, internal cards usually support higher resolutions.

Many internal cards have 2 or 3 outputs, often a combination of VGA, DVI and HDMI. Of course as we don't know the optiplex model you have, we don't know what interfaces it uses. If it isn't too old it'll likely be PCI-Express, and depending on the PC's form factor, it may need to be a low profile card.
I have used Matrox before and they work fine. Bit of a clunky box but works well.

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Gary CaseRetiredCommented:
I'd use a USB video adapter.    There are a variety of choices available, depending on what resolution you need and whether or not you have USB2 or USB3 ports [I suspect you only have USB2].

Newegg has plenty of choices:
Gary CaseRetiredCommented:
For a specific suggestion, I have one system that's using this adapter, and it works very well:
Miguel MonteiroPresentations Master DesignerCommented:
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