Only one available -- thought I'd post it here because that's pretty cheap for a somewhat manageable gigabit switch with 4x SFP+ 10G ports..
Amazon.com: Buying Choices: D-Link Systems 28-Port Gigabit SmartPro Stackable Switch & 4 10GbE SFP+ Ports (DGS-1510-28X)
Amazon.com: Buying Choices: D-Link Systems 28-Port Gigabit SmartPro Stackable Switch & 4 10GbE SFP+ Ports (DGS-1510-28X)