This message was posted on behalf of Intel Corporation
Thanks for your interest in the Intel Realsense Technology.
The USB cables can't be acquire as a spare part, you should know that this cables have been test and rated specifically for the camera. We can't recommend to use another, because it may or no may not work.
Now that said, if you still want to try with another cable, see this thread (Cable length for SR300) where a customer uses another USB cable that work for him.
Hope you find this information useful, have a nice day!