BRS is about the only site that does group buys that you can participate in on a site with people scattered all over the world. Local clubs are generally the best place to do group buys for livestock. I know that KRS has a group buy planned for live aquaria soon, and they just did one for reefcleaners a couple weeks ago. Not sure how close you are to Lexington, but that would be a good avenue to check out if you're within reasonable driving distance.
"What, exactly, is the internet? Basically it is a global network exchanging digitized data in such a way that any computer, anywhere, that is equipped with a device called a 'modem', can make a noise like a duck choking on a kazoo." - Dave Barry