1. Always make an "I'll Take It" type post in the thread where the sale is advertised. This creates a public record of the intent. Posts *always* over-ride PM inquiries when there is a debate.
An "I'll take it" or "Dibs" post creates the contract. Some will say "I'll take it, pending the answer to my question" and that will do. Others will say "I'll take it if the first deal falls through" and that person will have second dibs, and so on. Generally though, once the product has sold the thread gets closed either after payment has taken place or once a payment arrangement has been made. If you have questions, feel free to contact any of the moderators.