Question Trade Plugin Help

So basically on a server I played on a while ago there was function where a sign would 'store' items that were sold to it.
The signs weren't owned by anyone, they were just server based I guess...
But the way they worked was you could either buy or sell to the same trade sign and the items you sold to the sign would be stored in it as 'stock' of sorts, then another player could come and buy the item from that same sign but they could only buy as much as the 'stock' the sign had at the time...

E.g: An admin makes a sign to trade diamonds 1 at a time, the sign doesn't have any items in it at this time.
Then someone with 10 diamonds comes and sells them to the sign for the per diamond price.
The sign now has 10 diamonds in stock.
Say someone now comes along and wants to buy 11 diamonds from the sign, they cannot get 11 as there is only 10 in stock, so they must only get 10.

This method prevents items from being "created out of nothing" -- By this I mean someone cannot go mine some cobble, sell it to the cobble sign then use that money to buy diamonds from another sign right at the start of a server for instance. They could however, mine cobble, sell cobble and buy diamonds if there was some in stock at the sign (someone had sold some diamonds they had mined already to the sign).

I want to know if such a plugin exists and if it does what is it called and where can I get it.

I don't know how to explain it better but if you are confused about a part just ask me.

PS: if a plugin like Essentials can do that and I just don't know it, let me know how to do it and that would resolve the thread.

Thanks in advance Plugin-Gods,
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@Chief Keef
I see you double posted. Remember, you can bump your thread every 24 hours if no one responded.

I don't think there is a plugin like this that currently exists (or atleast, I am not aware of any). You may want to create a Plugin Request. If you would like me to create it, create a new thread in that forum, detailing all the features you want for it, and tahg me (by including the @Zombie_Striker tag)

 

Ah, sorry for double posting. I'm new and had no idea I could bump my thread.
@Zombie_Striker Thanks for replying
I will make a plugin request post this afternoon.
Cheers