Hello Ownedcore! Wowgamerxx119 here to show you a little trick i have been doing since 5.0.4 has came out.
With 5.0.4 blizzard removed most of the reagents from the reagents vendors, but putting inscription mats used for changing your talents/glyphs.
What i have been doing i just buy a few stacks and put them individually on the Auction House for 2-3 gold to make sure they get sold.
I consistently keep a few stacks on so i always make some money.
NOTE!!! - do not spam it in trade saying, " WTS Dust...." people will flame you saying you can just buy them from the reagents vendors and could possibly take some profit away
from those noobs about to buy your dust.
I have made about 2000 gold in the past 3 days and that's with about 5 minutes of effort everyday.
Don't expect all of your dust to sell. I usually have a few not sell and have to repost but don't worry you will still gain money even if all of them sell.... It all depends how many you put on at once. i usually put like 150 individuals on.[
For the Horde a person you can buy the dust would be - Horthus - NPC - World of Warcraft
For the Alliance a person you can buy the dust would be - Kyra Boucher - NPC - World of Warcraft