Abstract: A method and a system to conduct an on-line auction within a network-based commerce system with respect to offerings on a registry. The method includes in particular receiving offer data pertaining to offerings from a plurality of potential sellers, the offer data including seller identification data and offering identification data. A registry associated with at least one registry owner is provided, with the registry including registry owner data, registry user data and a registry offerings list including offering identification data associated with offerings selected by the registry. Access to the registry's offerings list is provided to a plurality of registry users on the registry users list. Bid data from one of the registry users on a particular offering on the registry's offerings list is then received.