AccuStock: Bundle Inventory

Sell the same item as singles, multipacks, and bundles, and each one is tracked separately - so the shared stock drifts and you oversell. AccuStock keeps a single shared count instead. Set up an item once and link each variant: a single counts as 1, a 3-pack as 3, a gift set as 1 of each. Every order, cancellation, and refund adjusts the count automatically and updates availability per location. Every change is logged - even edits made outside the app - so you always know what happened.