1. A method to facilitate network-based commerce, the method including: generating a map file storing a first plurality of records, the first plurality of records respectively storing summarizing information for a first plurality of offerings, the first plurality of offerings including a second plurality of offerings, the first plurality of records including a second plurality of records, the second plurality of records respectively storing summarizing information for the second plurality of offerings, the second plurality of records grouped to facilitate a reduction in processing to retrieve the second plurality of records, the generating being performed by a server machine of a network-based commerce facility; receiving a request from a user; determining a site that the user accesses, the site being one of multiple sites operated by the network-based commerce facility; retrieving a category list available for the site and retrieving the second plurality of records from the map file, the second plurality of records associated with the second plurality of offerings, the retrieving responsive to receiving the request, the category list identifying categories of the second plurality of offerings available via the site that the user accesses; and communicating the category list to the user, the category list including offering categories including the second plurality of offerings including a first offering available for sale via the network-based commerce facility in a location including a particular region, the first offering including a listing currency and a native currency that is associated with the particular region.