Speaking from experience:
It is even more frustrating when you organize a group buy, then when it is too late someone says, "oh, i could get it for $100 cheaper". You don't only feel ripped off you also feel like you have ripped off the other people involved.
So it's great that a cheaper price has been found, as now we may be able to get it even cheaper .
I am interested, as i almost bought one for $595!. I have book marked the location so if we can't get a group buy happening, i might buy it myself for $400.