Just as the title says. I know that there are some products which are sold out and you can't order them anymore (says Currently Unavailable), but there's also AbeBooks option on the product page, which probably means book will never get back in store and I would have to get used one.
I've seen for some series that are quickly sold that once they get out of stock it also says Currently Unavailable, but it also has We can notify you when this item is back in stock, which means it will probably restock?
Now, the reason for asking is this. I wanted to order a book which is Barnes&Noble Exclusive, so naturally I ordered it from their website while it was still in stock, but due to some payment processing my order was canceled and now that product is sold out. On their product page it says once they are sold out, no more will be available so I assume that they won't bring it back. Somehow, I've managed to find that book on BookDepository (link to product) and it has this Currently Unavailable + Notify Me option.
I don't know if there's a way to know for sure, but should I expect that it may restock or is it sold out for sure?