Generally, if an item is not in stock, you will not be able to purchase it.
If there is a glitch, we will advise you by email and ask you if you want us to hold your order until it is back in stock. If not, we will refund the difference to your PayPal account, and advise you when the item is back in stock, if requested.
It is possible, for example, that only one item is available and someone else completed their order before you, in which case you will be prevented from completing the order.
If you want to know when we expect a product to be back in stock, please send us an email to firstname.lastname@example.org