If you search for a product you have bought here before, and it doesn't appear, then it is out of stock. (Out-of-stock items remain invisible.)
If your product does appear, just click to the full product page and you'll see the current stock count above the product description. In rare cases there may be an error in stock. If you order something that we can't find, we'll always call you and suggest a substitution or give a refund.