Rybozen 6-in-1 USB 3.0 Card Reader, Aluminum Data USB 3.0 Hub with 3 High-Speed Ports and 1 CF/SD/TF Card Reader, 12" USB Cable for Mac Pro, iMac, MacBook, Laptop and Desktop PC-USB
Amazon.com: SABRENT 4-Port USB 3.0 Hub for iMac Slim Uni-Body (HB-IMCU) : Electronics