BAD, BAD Online shopping experience and a lost deal

Macro Shopping cart does not obey shopping rules. I checked out the item I wanted (a Nikon 70-300mm zoom lens) at 07:00am exactly, the moment the 'Add to Cart' button came live. It was added to my cart @ the special price of R999 as expected. I clicked on checkout and it went to the delivery details. I then tried to go further, but the system failed to go any further. It then told me that the item was no longer in stock. In a real store, this would be the equivalent of *****ing an item out of your hand. UNACCEPTABLE !!!!!!! MACRO - please get some REAL programmers and some brains!!!