General Knoppix support for those who've read the FAQ at the Wiki
Cisco QSFP-100G-LR4-S 100GBASE-LR4 QSFP28, 1310nm, 10km, LC, SMF
$335.99
Cisco SFP-10/25G-CSR-S 10/25GBASE-CSR SFP28, 850nm, 100m, LC,
$54.00
Cisco GLC-GE-100FX 100BASE-FX SGMII SFP, 1310nm, 2km, LC, MMF
$83.99
Silicom (PE210G2SPI9A-XR) 10Gb Dual Port SFP+ PCIe Ethernet Adapter Low Profile
$19.99
Genuine Cisco SFP-10G-SR V03 10GBASE-SR SFP+ Transceiver Module 10-2415-03
$8.00
Lot of 10 - HP 10Gb SR SFP+ Transceiver 455883-B21 455885-001 456096-001 850nm
$23.99
NEW Sealed Cisco SFP-10G-LR 10GBASE-LR SFP+ 1310nm 10km *US Shipping*
$18.00
Brand New Cisco GLC-LH-SMD 1000BASE-LX/LH SFP Module 1310nm 10km SMF LC
$13.89
LOT OF 20 Genuine Cisco SFP-10G-SR V03 10GBASE-SR SFP+ Transceiver Module
$89.00
SFP-10G-SR V03 Original CISCO 10-2415-03 850nm 10GBASE-SR SFP+ Multi mode Module
$6.80