:o
Actually, there is a way to track down a specific item.
However, there isn't really a way to get a list of all the people that own that "type of item".
Example of what you can't do:
I want to buy a void force from someone so I'm going to have a list generated of everyone who owns that item.
Example of what you can do:
I saw someone buy an item(s) I wanted from someone and I want to track it down to see if I can buy it off of the current owner. I'll do an example with a flame, as it sometimes happens when you see a flame you really want but you weren't able to buy it in time, or didn't have the TC. So, what I can do is find the date when it was transferred from one player to another in the transaction history.
Using this flame found on this thread as an example - http://forum.toribash.com/showthread.php?t=550420
I go to his transaction history and find the name of the item transferred. In this case it would be Flame, also note you can use Ctrl+F search function to find it easier.
And from here, you can see who the current owner of the item is if you look to the far right.
So, if you want a type of item what you can do is find a thread on the forums where someone has sold their Void Force or whatever, and track it down to whoever has it now. All you have to do is get the date it was sold from the thread, and find the corresponding date with the transaction history.
For example, I searched Void Force on the Items section of the market and tracked a Void Force sold by Brie to DDos as seen below;
:o
Hope this helps.
Note: forum search function is only for Toriprime/Staff so you would probably need to try and find a thread using Google if you don't have it.