Yes, when someone clicks to buy a cel, it is 
removed from Taro's visible database. This is the 
beauty of their system, personally (and I wish 
people would stop complaining that they don't 
know what they missed ^_-) .. This is also why 
you are asked "do you REALLY want to buy this?" 
on your first click - clicking to buy is a 
contract that you will not back out of your 
purchase. If you do back out of your purchase, you
won't be able to buy from Taro again.