Belkin F5U507 Hi-Speed USB 2.0 and FireWire 6-Port Hub for Mac Mini
StarTech.com 4-Port USB Hub, USB 3.0 5Gbps, Bus Powered, USB-A to 4xA w/ Optional Auxiliary Power, Portable Laptop USB Hub, 1ft/30cm Cable - Portable USB-A Expansion Hub for desktop or laptop computers -