There are tons of ways to find the missing or more rare Yugioh cards from your collection if you are creative and persistent. Ebay is always a good way to go when you are looking for anything Yugioh. Ebay even has a tool which allows you to enter what you are looking for and every time an auction with your key words starts, you will receive a notification email.
You could always do a Google search which might bring up Ebay alternative sites for finding the Yugioh card that you need. Other online resources include Yugioh fan sites, Yahoo groups for Yugioh fans to trade or buy cards and even various Yugioh online retailers.
Another online resource for rare Yugioh cards that is a also a local option is Craigslist.com. Craigslist is an online community based on local cities where people find other people with similar interests like Yugioh and also where they buy and sell things like rare Yugioh cards without any fees like on Ebay.
Rare cards can also be found at comic book shops or conventions. You could also put up signs at your school (get permission first) and start a Yugioh card trading club. Hunting down your favorite or most wanted card can be as fun as actually getting it for your Yugioh collection.
Yu-gi-oh! on the CW's 4K!DS TV
I love yugioh !!!!!!!!!!!!!!!!...