http://www.best3dgraphiccard.com/dual-video-card/
Dual Video Card
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PNY nVidia GeForce 8400 GS 512 MB PCI Video Graphics Card VCG84512SPEB - Retail List Price: $74.99 Sale Price: $43.50 Average Rating:   |
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Upgrade your PC with the almost universal Verto 8400GS PCI for amazing performance with support for the PCI bus. 
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EVGA 01G-P3-N945-LR GeForce 9400 GT 1GB DDR2 PCI-E 2.0 Graphics Card List Price: $81.99 Sale Price: $57.84 Average Rating:  |
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The features of the 9400 GT 01G-P3-N945-LR include the GeForce 9400 GT(550MHz clock) chipset, 1GB of 128-bit DDR2 memory with a 400 MHz clock with an effective rate of 800 MHz, 1400MHz Shader Clock, 16 processing cores, PCI Express 2... |
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EVGA 512-P2-N738-LR GeForce 8400 GS 512MB DDR2 PCI-Express Graphics Card List Price: $50.99 Sale Price: $32.95 Average Rating:  |
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The eVGA 512-P2-N738-LR NVIDIA e-GeForce 8400GS 512 MB PCI-E Graphics Card features 512 MB of 128 bit DDR2 memory with a 4.26 GB-per-second memory bandwidth. Based on NVIDIA unified architecture with GigaThread technology, the card offers full Microsoft DirectX 10 Shader Model 4... |
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ASUS Radeon EAH4350 512MB DDR2 PCI-Express Silent Graphics Card List Price: $51.99 Sale Price: $29.99 Average Rating: |
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ASUS EAH4350 SILENT/DI/512MD2(LP) Radeon HD 4350 512MB 64-bit DDR2 PCI Express 2.0 x16 Low Profile Video Card (DVI /─ /2nd VGA /HDMI /─ /HDTV Support) Hybrid CrossFire Ready |
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EVGA nVidia GeForce 7200GS 512 MB VGA/DVI/TV-out PCI-Express Video Card 512-P2-N430-LR List Price: $49.99 Sale Price: $29.04 Average Rating: |
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The features of the 7200 GS 512-P2-N430-LR include the GeForce 7200 GS (450 MHz clock) chipset, 512MB of 64-bit 2.5ns GDDR2 memory with a 532 MHz effective rate, PCI Express compatibility,4.26GB per second memory bandwidth, CineFx 3... |
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PNY 6200 512 MB AGP DVI Graphics Card VCG62512APB List Price: $44.99 Sale Price: $40.00 Average Rating:  |
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GEFORCE 6200 AGP 512MB 64BIT CTLRVGA DVI HDTV/SDTV |
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EVGA 512-A8-N403-LR GeForce 6200 LE 512MB DDR2 AGP Graphics Card List Price: $66.99 Sale Price: $41.99 Average Rating: |
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The features of the 6200 LE 512-A8-N403-LR include the GeForce 6200 LE (300MHz clock) chipset, 512MB of DDR2 memory with a 532MHz clock with an effective rate of 1064MHz, AGP 8X compatibility, Integrated NVIDIA TV encoder, 4... |
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PNY GeForce FX 5200 PCI 256 MB 2 Port VGA + S-Video Graphics Card VCGFX522PEB - Retail List Price: $56.99 Sale Price: $36.99 Average Rating: |
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Leave the dull world of integrated graphics technology behind and enter the World of Cinematic Computing. The NVIDIA GeForce FX-Series graphics cards deliver industry-leading features and performance enabling special effects on par with Hollywood films... |
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 Nvidia Quadro4 980XGL AGP Dual DVI 128 Video Card  US $10.50
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 Nvidia P169 Quadro4 NVS280 PCI Dual VGA 64 Video Card US $4.99
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 3 Nvidia Quadro4 200NVS AGP Dual Monitor 64 Video Card US $4.99
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 $100 Value Nvidia Quadro FX 1100 128 MB Dual Video Card US $14.99
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 Nvidia Quadro FX1300 128MB PCI E Video Card Dual DVI US $19.95
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 Matrox Epica 64MB Dual PCI Video Card EPI TC2P64LPAF US $95.00
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 MATROX MILLENIUM G450 AGP 32MB DUAL VIDEO CARD US $19.99
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 NVIDIA QUADRO FX VIDEO CARD MODEL P128 Dual DVI AGP US $9.99
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 Quadro NVS 290 256MB Dual DVI PCIe Video Card US $9.99
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How do dual monitors and video cards work? Do you have to get two separate cards?
Back in the days, you would have dual video cards, but now the motherboards have dual support? does that mean 2 video cards?
There are a couple ways to do it...Either:
1) 2 Video Cards (Each with 1 Display Port), 2 Monitors
2) 1 Video Card (with 2 Display Ports), 2 Monitors
OR
3) 1 Video Card (with 3 Display Ports), 3 Monitors 
Use for dual display or triple display (example)
http://www.ati.com/designpartners/media/logos/popups/RadeonX1950.asp?pic=RX1950.jpg&tlid=RX1950.jpg