General Knoppix support for those who've read the FAQ at the Wiki
New Precision DWDM SFP+ 10G 80km Tunable Transceiver 50GHz C-Temp DWDM-SFP10G-C
$90.00
Cisco WS-C2960X-48FPD-L 48 V07 POE+ GE+2 10G SFP+, LAN BASE 740W w/ C2960X-Stack
$140.00
ProLabs 10GBase-TX SFP+ RJ-45 Copper Transceiver Module P/N: SFP-10GBASE-T-C NEW
$34.99
New Sealed Cisco GLC-LH-SMD 1000BASE-LX/LH SFP Transceiver Module *US Shipping*
$9.50
SFP-H10GB-CU3M Cisco 10GB SFP+ Twinax Copper 3M Passive Cable
$7.99
CISCO SFP-10G-LR SFP TRANSCEIVER MODULE GBIC 10G 10GB SFP - 1 Year Warranty
$39.99
NEW FS SFP-10G-T 10GBASE T SFP+ 30M Transceiver Module (Lot of 1 Unit)
$39.95
Mellanox Original MFM1T02A-SR 10GbE 10GBASE-SR SFP+ Transceiver
$9.00
TP-Link TL-SG2210P - JetStream 8-Port Gigabit Smart PoE+ Switch w/ 2 SFP Slots
$79.99
Green Label Hologram SFP-10G-T-X 10GBASE-TSFP+ Transceiver Module RJ45 30m
$69.00