Supermicro - AOC-2UR68-B2TS-O - Riser Adapter 2U 2-Port 25GbE SFP28 AOC-2UR68-B2TS-O - Supermicro - 2U Ultra Riser Adapter with 2-port 25GbE SFP28, Based on Broadcom $303.53
Supermicro - AOC-2UR68G4-M2TS - Riser Card 2U 2-Port 25GbE SFP28 PCIe AOC-2UR68G4-M2TS - Supermicro - Ultra Riser Card 2U 2-port 25GbE SFP28, based on Mellanox CX-6 LX, 1 PCIe $446.29
Supermicro - AOC-URG4N4-M2TS-O - Riser Card 1U Dual Port 25GbE SFP28 AOC-URG4N4-M2TS-O - Supermicro - Ultra Riser Card 1U with Dual port 25GbE 2x SFP28 $423.43
Supermicro - AOC-URN4-m2TS-O - Riser Card 1U 2-Port 25GbE SFP28 PCIe 3.0 AOC-URN4-m2TS-O - Supermicro - 1U Ultra Riser 2-port 25GbE SFP28 Mellanox ConnectX-4 Lx EN, 1 PCI-E 3.0 x16 (internal), 4 NVMe ports $313.94
Supermicro - AOC-2UR68-I2XT - Riser Card 2U 2-Port 10GBase-T AOC-2UR68-I2XT - Supermicro - 2U Ultra Riser AOC for 2x 10GBase-T port $118.85