As a hypothetical, I successfully added 1000 copies of book 3 to my shopping cart for a grand total of $59,950US.
Perhaps they are just hypothetically in the cart until you try and actually pay, or after payment you get a rejection of the order? No guarantee that the stock levels are actually audited and correct.
Except for this:
http://www.schifferbooks.com/newschiffer/ordering.php"Availability: Unless you find the book in our Sneak Preview section, 99.9% of our books are in the warehouse and ready for immediate shipment (the other 0.1% have sold out and are being reprinted). There is no waiting for a special order, no holding up your order until that third book arrives so you can save postage. If you want the book there is 999-to-1 chance that it will be in transit to you within 24 hours."
I guess it must fall into that 0.1% exception to the guarantee....
