General Knoppix support for those who've read the FAQ at the Wiki
Finisar FTLX8571D3BCL SFP+SR/SW 10Gb/s 850nm Multimode SFP+ Transceiver Grade A
$7.70
Brand New Cisco GLC-LH-SMD 1000BASE-LX/LH SFP Module 1310nm 10km SMF LC
$10.99
New Precision DWDM SFP+ 10G 80km Tunable Transceiver 50GHz C-Temp DWDM-SFP10G-C
$90.00
ProLabs 10GBase-TX SFP+ RJ-45 Copper Transceiver Module P/N: SFP-10GBASE-T-C NEW
$34.99
Genuine Cisco ‎SFP-10G-SR Transceiver Module (10-2415-03)
$5.85
TP-Link TL-SM331T | 1000Base-T RJ45 SFP Module | 1.25G Copper SFP Transceiver
$10.00
Genuine Cisco SFP-10G-SR V03 10GBASE-SR SFP+ Transceiver Module 10-2415-03
$8.00
CISCO SFP-10G-LR SFP TRANSCEIVER MODULE GBIC 10G 10GB SFP - 1 Year Warranty
$39.99
Fully Compatibility 10GBase-T Transceiver SFP-10G-T 10G SFP+ to RJ45 Copper 30M
$51.99
New Sealed Cisco SFP-10G-LR 10GBASE-LR SFP Plug-in GBIC Transceiver module A
$15.80