Your search for "mcx4121a-xcat" revealed the following:
nVidia Mellanox MCX4121A-XCAT ConnectX-4 LX 2x 10GB SFP+ PCIe 3.0 x8 NIC
SKU: NSB-8597
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 104.99
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NEW nVidia Mellanox MCX4121A-XCAT ConnectX-4 LX 2x 10GB SFP+ PCIe 3.0 x8 NIC
SKU: NSN-1089
Condition: New
Shipping: Overnight Options
Warranty: 365 days