Amazon.com: NVIDIA Quadro 4000 2GB GDDR5 256-bit PCI Express 2.0 x16 Full Height Video Card (Renewed) : Electronics
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 RTX4000 8GB Full Height Graphics Card | Dell USA
NVIDIA Quadro 4000 2GB GDDR5 Video Card VCQ4000-PB
NVIDIA Quadro 4000 2GB GDDR5 256-bit PCI Express 2.0 x16 Full Height Video Card with Rear Bracket
Refurbished: Nvidia Quadro 4000 2GB 256-Bit GDDR5 Standard Height Workstation Video Card - Newegg.com
NVIDIA Quadro 4000 2GB GDDR5 256-bit PCI Express 2.0 x16 Full Height Video Card