What do “In Stock”, “Pre-Order” and “Out of Stock” mean?

In Stock — we currently have stock available, though quantities may be limited. Statuses may lag slightly as other customers may have just purchased remaining units. Pre-Order — the product is purchased based on customer orders; supplier stock was available as of the previous week. Out of Stock — the product has been unavailable for over a month; the restock date is currently unknown because the supplier has no stock. Note: product statuses are not real-time and are updated every evening.