Refurbished: nVidia Quadro 4000 2GB GDDR5 PCI-E x16 2.0 Graphics Video Card With DVI and DisplayPort Outputs 38XNM Standard Height Workstation Video Card - Newegg.com
Used Nvidia Quadro 4000 2GB GDDR5 PCI Express x16 Desktop Video Card - Walmart.com
Amazon.com: NVIDIA Quadro 4000 for Mac by PNY 2GB GDDR5 PCI Express Gen 2 x16 DVI-I DL, DisplayPort and Stereo OpenGL, DirectX (Boot Camp), CUDA and OpenCL Profesional Graphics Board, VCQ4000MAC-PB :
Dell Nvidia Quadro 4000 2GB GDDR5 Graphics Card
NVIDIA Quadro 4000 2GB GDDR5 256-bit PCI Express 2.0 x16 Full Height Video Card