LockCircle has announced its new LockPort USB, which is designed to help avoid damaging your 5D Mark III and 5D Mark II mini USB camera port.
Previously, LockCircle released the LockPort HDMI port savers, which proved successful and led to the logical development of a port saver for USB ports on HDSLRs. LockPort HDMI was eventually developed and released for Nikon D600 and D800 HDSLRs, so I would expect a LockPort USB model to be in the works for those cameras as well.
LockPort USB is available for $139 direct from LockCircle. More details here on LockCircle’s website.