To check stock level all that is required is to add the item to your shopping cart. If the item can be added to your shopping cart, it is in stock and available for immediate shipment within 1 business day (often same day). There isn't any way to "double check" stock levels, as this is the exact same method our staff would use to check inventory.
To put it simply: If you can add an item to your shopping cart it will be shipped according to our shipping policy.