AUTOMATIC SEARCH OF LOCAL INVENTORY

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for determining which of multiple vendors have a product in stock. One of the methods includes maintaining a central database that includes information about respective inventories of multiple vendors, receiving information from a first user device identifying a requested commerce object, and a geographical area, identifying a plurality of sources of available inventory data, searching the plurality of sources for available inventory of the requested commerce object, the searching comprising performing all three of the following processes substantially in parallel: performing real-time searching in the central database, performing sub-real-time searching in respective databases maintained by individual vendors, and initiating manual-assisted searching, asynchronously receiving and aggregating search results into groups, and serving, for each of the groups of search results, instructions for a presentation of the respective composite user interface to a second user device.