SleepyReef;809050 wrote: I will answer your question.
A group buy at BRS consists of something like 10 people getting together and one person sends BRS an email with all of your user names. You get an email from BRS when the group buy starts. You log into your account and it should indicate that you are part of a group buy. Most things are discounted, but big ticket MAP items are not.
After the group buy you receive the title PREFERRED REEFER. You will get slightly discounted prices over the general public that have not participated in a group buy with BRS. Another way to become a PREFERRED REEFER is to do a set amount of reviews.
Any random 10 people can get together for a group buy since they ship to each individual. It is nice and saves you a few bucks. It is usually easier to find 10 random people that want to purchase something from BRS on a specific week through more national forums like R2R, Nano-reef, or RC.