A collectible conditional purchase offer (CPO) management system is disclosed for receiving and processing individual CPOs from buyers for one or more collectibles, such as coins, stamps, art prints, comic books, baseball cards, jewelry, or other used or secondary market goods. The collectible CPO management system processes each received CPO to determine whether one or more sellers are willing to accent a given collectible CPO. If a seller accepts a given CPO, and ultimately delivers goods complying with the buyer's CPO, the buyer is bound on behalf of the accepting seller, to form a legally binding contract. The CPO is guaranteed, for example, by a general-purpose account, such as a credit or debit account. Once a CPO is accepted by a seller, but before completing the transaction, the goods are preferably forwarded to a dealer/authenticator for evaluation. The dealer/authenticator preferably validates, authenticates and optionally guarantees the goods, while also serving as the distribution point for the collectibles sold by the collectible CPO management system. In order to ensure that at least one of the accepting sellers will have the collectible item in the condition specified by the buyer, a number of sellers may conditionally accept each CPO. Each of the accepting seller(s) are preferably prioritized into a hierarchy based on predetermined criteria.