The cost quoted was for the adapter that comes with software, no additional costs, and includes dvi/vga adapters..... I am sure you could probably find a fairly cheap video card with dual monitor support, but Josh's computer has a perfectly good onboard graphics card, and his pc is only a few month old. The usb adapter is quick and flexible, and does not require you to open the hood, or have any technical knowledge. Its also portable, you can throw it on any pc in seconds. So a new dual video card will work, but he does not "need" to get one.
Andrew
Ps: here is a snipet from the product summary for the sabrent version available on Tiger Direct.
The USB 2.0 to DVI/VGA or HDMI Adapter enables you to connect up to 6 monitors, LCD's, TV's or projectors to your PC or notebook. You can use it as an extended desktop or as a larger/different display from your main screen. By using USB 2.0 technology, there is no need to open the computer or struggle with compatibility issues related to a second VGA card.
Extending your desktop has never been easier with the USB 2.0 to DVI/VGA or HDMI Adapter! Install the included software, plug in the adapter, and you are on your way to dual monitor computing. Now you can easily expand spreadsheets over 6 monitors, read e-mail on one monitor and view the attachment on the other, make multi-screen presentations without a second computer, or expand your graphics workstation or mirror your monitor.
The USB 2.0 to DVI/VGA or HDMI Adapter is perfect for laptop users who don’t have the capability of adding an extra video card. It is also a cost-effective solution for desktop users who don’t want the hassles of installing an internal video card. USB 2.0 technology allows you to use this device with numerous computers versus an internal card that can only be used with one. Since this adapter is bus-powered, no additional power cables are needed. Whether you want to use the USB 2.0 to DVI/VGA or HDMI Adapter with your laptop or with your desktop, you’ll enjoy the ease of use and quality of picture this device delivers.
If he's going to need $70 to $100 is software. What is a video card with dual outputs going to cost?