General Knoppix support for those who've read the FAQ at the Wiki
Dell PowerConnect 6224 Rackmount 24-Port Gigabit Managed Ethernet Network Switch
$31.99
Dell X1018 X-Series Smart Managed Switches 16-Port Gigabit 2-Port SFP Switch
$42.00
Cisco Catalyst WS-C3650-24PS-L 24-Port Gigabit Ethernet Network Switch TESTED
$49.99
Cisco Catalyst WS-C3750X-48PF-S 48-Port Gigabit Network Switch With 10G Module
$19.70
TP-Link 5-Port 10/100/1000Mbps Gigabit Easy Smart Switch (TL-SG105E)
$17.99
TRENDnet TEG (TEG-S80g) 8-Port Gigabit GREENnet External Switch Version V3.1R
$12.64
Ubiquiti UniFi 24-Port Managed Gigabit Switch with SFP (US-24-250W)
$99.99
New 10/100 Mbps 8 Ports Fast Ethernet LAN Desktop RJ45 Network Switch Hub
$11.49
Cisco Catalyst WS-C3560-48TS-S 48-Ports Rack-Mountable Switch Managed H12
$28.95
TP-Link 24-Port Gigabit Ethernet Unmanaged Switch Desktop/Rackmount TL-SG1024D
$59.49