they were only available in stores for a very short period of time, I think there was a olive green pair released at the time too. I dont have any other info. They are a very nice pair since it seems like everyone has the black/gold model.
It's not that they are extremely limited, it is just that they are older than the current releases, which of course in time will be hard to get hold of too. edit: I have the black/gold ones which I wear all the time, but I just want some variety.
Well you won't find them anywhere else! I know this guy and he is legit as I have bought from him before. Let me know if you want me to introduce him and he might give you a decent deal. These GM are even rarer than than the grey evidence as it's the first time I have seen them appear for a long time.