[Guide] Using cross Realm zoning to get limited supply items

This is another use for the cross realm zoning.
Go to a vendor that you would like to buy some limited supply items.
If the vendor does not have the items you are looking for get invited to another realm and try again.
An example of limited supply items would be sold by Qiff - NPC - World of Warcraft .
This vendor sells Very expensive engineering items for at most 4g and 80s like Khorium Power Core - Item - World of Warcraft .