A computer-implemented system for dynamic inventory balancing including at a processor and a memory device comprising instructions that when executed configure the processor to perform operations. The operations including receiving an inventory data feed from at least one fulfillment center, storing (in a database) a plurality of virtual bundles with associated grouping numbers and quantities—the plurality of virtual bundles having item bundles grouping two or more of a same item in the inventory data. The operations also include exposing the database to queries from a seller portal through at least one of RESTful service, a queue based system, an index, or an object table and receiving a client order, the client order comprising a bundle selection from the plurality of virtual bundles, and updating the plurality of virtual bundles by rebalancing the plurality of virtual bundles and corresponding associated quantities based on the bundle selection.