6 ways to deal with out of stock products and save your saleState if a product is unavailable permanently or temporarily. Give alternative recommendations. Inform your customer about the product's return. Limit out-of-stock page visibility. Show the availability status clearly. Offer pre-orders and increased shipping time.
The most obvious way to know when a product has been restocked is to set up a notification system. Some online retailers let you sign up for email or app alerts when a particular item is back on the shelves, so if you see that option, go ahead and subscribe.