I missed the previous $80 CX-4 deal, but I found this
MCX354A-FCCT CX354A MELLANOX CONNECT-3 4099 FDR10 40/56GbE 2 PORT QSFP ADAPTER | eBay
Different from MCX354A-FBCT, the above one is MCX354A-FCCT (ConnectX-3 Pro)
Different from MCX354A-FBCT, the above one is MCX354A-FCCT (ConnectX-3 Pro)