Hey,
I have a left asterisk knee brace size medium: http://www.backcountry.com/asterisk-cell-knee-protection-system-left-knee
It has never been worn, but has a sticker on it. After blowing my knee my parents went nuts and bought both left and right braces for me. I blew my right knee and dont like the extra bulk so I have no use for the left one.
This has never been used and Im willing to part with it for $150. These things are insane, so if you have left knee issues, it is just the thing.
Size chat is on backcountry.com's page listed above