expression
in stock; in inventory
Fixed phrase used in commercial contexts to indicate that an item is available for purchase or currently held in stock.
この商品は在庫ありですので、すぐに発送できます。
This item is in stock, so we can ship it immediately.
サイトに「在庫あり」と表示されていても、実際には品切れの場合がある。
Even if the site shows 'in stock,' it may actually be out of stock.
Compound of 在庫 (zaiko, 'stock, inventory') and あり (ari, 'exists, there is'), literally 'there is stock.'