My diving community is small. There's a chat group of divers and I know that shop representatives and owners are in there, everybody loves their seasonal promotions from time to time and other dive news, trip cost-sharing opportunities, and dive info is posted in it. There's been this person in particular posting group buys of a limited number of signups, and some of them are really cheap. For instance a mares bag worth about USD220 for USD75, or a Garmin for USD150 off retail. I messaged him privately to ask who he is, because if he has a shop I would have been happy to check him out. The way he answered was cold and the conversation went downhill with him dodging the question at first, and then saying, I don't see a need to tell you. I think he has since blocked me because I don't see the conversation anymore. My question is, where do all these people source group buys from? Is it legit? What is underlying, to make him have to dodge the question?