Some items in the game are limited (ie. you can only buy a certain amount from the vendor, then you have to wait for them to respawn). I've only tested this on single limited items (vendor only has 1) but it's worked for me the last 4-5 times I've done it right, and I assume it would work for the multiple limited items if there's only 1 left.

Basically all you do to setup is talk to the vendor and open up your bags. Then you right-click the item you want to buy, then quickly drag the item to your backpack (both are acceptable ways to purchase an item). If you do it fast enough you will be able to get 2 of them even though the vendor says they only have a limited supply of 1. If you do it too slow it'll say "The item not found". It's also easier if you have large bags because then you don't have to drag the item as far to buy it right after you right-click it.

Easy way increase Lockpicking skill in no time
You must be in the Horde.
You are a rogue wants to increase your lockpicking?
I was lvl 18 at the time....went to ratchet and got a quest about stealing a sea gem.
I can't remember what NPC name was but he is by the engineering building. You also receive a free lockpick.
You will have to know where the pirates area is and sneak up on the ship which is docked to shore.
Go inside the ship, there is an area with 5 chests inside the room.
Use lockpick to pick them.
You get parrot dropings, parrot feathers and other things.
However, keep clicking on chests to lock pick them they are always locked after looting. In about 10-15 minutes your lock picking skill will be 85

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