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 Plug-in GBIC Transceiver module A
$15.80
NEW Sealed Cisco SFP-10G-LR 10GBASE-LR SFP+ 1310nm 10km *US Shipping*
$18.00
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
NEW FS SFP-10G-T 10GBASE T SFP+ 30M Transceiver Module (Lot of 1)
$39.95
Arista 10G SFP-10G-SR 10GB 850nm SFP+ Transceiver XVR-00001-02 600pcs LikeNEW
$10.50
New Sealed Cisco GLC-TE 1000BASE-T RJ45 SFP Transceiver module *US Shipping*
$20.00
LOT OF 50 Genuine Cisco GLC-SX-MMD 1000BASE-SX SFP Module Transceivers
$140.00