General Knoppix support for those who've read the FAQ at the Wiki
New Cisco w/ Green Hologram SFP-25G-SR-S 25G SFP28 SR 850nm 300m LC MMF Module
$69.99
DELL SFP 25G SFP28-25G-SR-85C LTF8505-BE+-DEN1 Optical Transceiver 0HHHHC
$17.50
NEW Sealed Cisco SFP-10G-LR 10GBASE-LR SFP+ 1310nm 10km *US Shipping*
$18.00
GENUINE CISCO DS-SFP-FC32G-SW SFP NEW SEALED SEE PHOTOS SHIPS FREE
$69.99
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
$25.99
Cisco SFP-10G-SR SFP+ MMF 10GBase-SR 850nm Transceiver Module 1 Year Warranty
$28.49
Mellanox Original MFM1T02A-SR 10GbE 10GBASE-SR SFP+ Transceiver
$9.00
Cisco WS-C2960X-48FPD-L 48 POE+ GE+2 10G SFP+ LAN BASE (740W)
$84.99
New Sealed Cisco GLC-TE 1000BASE-T RJ45 SFP Transceiver module *US Shipping*
$20.00