You can buy in: http://www.cablematic.co.uk/search/ut81/SuperSpeed-USB-Cable-3_dot_0-_open_parenthesis_AM_slash_MicroUSB_hyphen_M-type-B_close_parenthesis_-50cm/UT81/
SuperSpeed USB 3.0 or USB connectors based USB 3.0 Type A male on one end and male MicroUSB B at the other end. Cable black or blue color that allows a bandwidth of 5 Gbps. Compatible with USB 2.0 (Hi-Speed USB) and USB 1.1. Cable length of 0.5 m.