It is no longer possible for the items that belong to the set to drop. If you are lucky, you might find a piece or two on the auction house as they are not entirely removed from the game, some people saved them. But the ability to have them drop from dungeons is removed from the game.
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The same place you get armor for any other class. Rewards from quests, Auction House, mob drops, and crafting.
orc gear
Anywhere really. Armor drops from monsters, players can sometimes make shoulder armor, or you can often buy (horrible) armor in even small towns. The auction house has some but you'll want to stay away from that till you get a real feeling for the game.
wrath
might
There is. Some vendors sell armor that doesn't have any stats on it which is basically a waste of money unless you want to buy it to RP(roll-play) and then there are some people that sell tier armor that you need to get tokens or whatever it is in the new expansion in order to get.
Priests due to the fact that they have cloth armor.
You can usually find them in instances(if you're level 15), and are more likely to get them if you're a warrior or paladin. If you are on the horde, there is a place in Orgrimmar in a tower where you can buy armor, but you have to be level 85.
Buy better armor.
You have to be a blacksmith and buy rune armor
Find an armor vendor and press the repair button in the transaction window.
Daddy Wouldn't Buy Me a Bow Wow was created in 1892.
Omega has multiple armor upgrades.