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 :
NVIDIA Quadro 4000 2GB GDDR5 256-bit PCI Express 2.0 x16 Full Height Video Card
HP nVidia Quadro 4000 2GB GDDR5 PCI-E x16 Video Card WS095AA [HP Quadro 4000] - $299.95 : Professional Multi Monitor Workstations, Graphics Card Experts
LOT OF 2 PNY/NVIDIA Quadro 4000 2GB GDDR5 256-Bit PCIe 2.0 x16 Graphics Card | eBay