Sewell Direct is debuting its own USB to DVI adapter for those needing to hook up multiple displays to one computer. It is called the USB to DVI External Video Card and pricing is set at around $150.

The Sewell USB to DVI External Video Card makes use of DisplayLink virtual graphics technology to let you connect up to six displays to one PC (each one needs its own adapter). This particular adapter works with Windows machines only at the moment and sports a USB port on one end and DVI input on the other.

StarTech.com prides itself in being a manufacturer of “hard to find connectivity and technology parts.” It thinks one of its latest offerings - USB adapters which let you add additional displays to a computer - may fit into this niche. These products are the USB2VGA2 USB 2.0 to VGA Display Adapter and the USB2DVI USB 2.0 to DVI Display Adapter, priced at around $117 and $180 respectively.

The StarTech.com USB2VGA2 USB 2.0 to VGA Display Adapter and the USB2DVI USB 2.0 to DVI Display Adapter both connect to a single USB 2.0 port on a computer, offering support for up to five separate monitors (requires one adapter per display). The USB2VGA2 works with VGA display resolutions of up to 1600 x 1200 (32-bit), and up to 1920×1600 at 16-bit color quality, while the other one does DVI display resolutions up to 1600×1200 (standard) (@32 bits) and 1680×1050 (wide) (@ 32 bits).