Mikrotik's new Cloud Router Switch CRS354-48G-4S+2Q+RM has 48 x 1G RJ45 ports, 4 x 10G SFP+ ports, and 2 x 40G QSFP+ ports in a 1U rackmount case with dual power supplies! ::
Cloud Router Switch 312-4C+8XG-RM with 8x 1G/2.5G/5G/10G LAN,
RM-KIT-CRS-7.5 - OEM Mikrotik Rack Mount Kit for CCR and one CRS Cloud Router Switch - white finish with screw kit :: Mikrotik Rack Mount Routers :: ICD Group, Inc
Linksys Official Support - Rack mounting the Linksys Smart Gigabit Switch
Amazon.com: Tripp Lite 24-Port Gigabit Ethernet Switch Rackmount Metal 1U, 2 Gigabit SFP Ports 10/100/1000Mbps (NG24) : Everything Else