With the group buy, a bunch of people get on the list (Carey is running one this week), you Private. message her your e-mail and last name. This list is sent to BRS, they send you an e-mail stating that you are on it, when the buy starts, that lasts a week. Everything on the site is discounted 5-20%!! You don't have to make a purchase at all, and after that you are what they call a preferred member, and receive a constant small discount.
It's really a no lose situation! I would get on it, even just to browse, to receive the future permanent discount.