General Knoppix support for those who've read the FAQ at the Wiki
ProLabs 10GBase-TX SFP+ RJ-45 Copper Transceiver Module P/N: SFP-10GBASE-T-C NEW
$34.99
Lot (10) Dell 0N8TDR 850nm SFP-10G-SR-85C 10Gbs sfp+ FTLX8574D3BNL-FC N8TDR NEW
$68.00
NEW Sealed Cisco SFP-10G-LR 10GBASE-LR SFP+ 1310nm 10km *US Shipping*
$18.00
New HP Aruba J9150D 10GBASE-SR SFP+ Transceiver Module
$35.88
Genuine Cisco SFP-10G-SR V03 10GBASE-SR SFP+ Transceiver Module 10-2415-03
$8.00
Cisco SFP-10G-SR SFP+ MMF 10GBase-SR 850nm Transceiver Module 1 Year Warranty
$28.49
Brand New Cisco GLC-LH-SMD 1000BASE-LX/LH SFP Module 1310nm 10km SMF LC
$10.99
Finisar FCLF8522P2BTL 1Gbps 1000BASE-T RJ45 (Copper) SFP Transceiver
$7.95
New Sealed Cisco GLC-TE 1000BASE-T RJ45 SFP Transceiver module *US Shipping*
$20.00
Original CISCO SFP-10G-SR V03 10-2415-03 850nm 10GBASE-SR SFP+ Multi mode Module
$6.80