Clubbing together is a cool concept, but online it just don't work. Over the last 20 years I tried that so many times. In the end it is always the same story: people don't pay in time, everybody wants the same item, people don't agree on maximum amounts, etc. The one arranging things is stuck with stuff he doesn't want plus a bill that isn't fully covered. My tip would be: buy the entire lot, keep what you want and sell the ones you don't like at 150%. People that start complaining about price, you took the risk, not they. So that's a fair percentage.
Life's easy!
Looking into the matter now.