Ocean Technology via Amazon offers the Unitek USB 3.0 4-Port Portable Ultra Slim Data Hub in Black for $9.49. Coupon code "XE2P5AKW" cuts it to $7.50. Plus, Prime members receive free shipping. That's $7 off and the lowest price we could find. It features data transfer rates up to 5Gb/s, built-in surge protection, and a micro USB power port for charging high-powered devices (micro USB cable sold separately).