I really dont know where to go to get blue,green,and black dragonscale, cause i need it for my armor.I cant find any at AH so i wandered where can i find it?
Did you try the search box on the left here? It will tell you which mobs drop the items and the drop percentage. Unfortunately, it doesn't tell you whether you need to skin the mob to get the item to drop - do you actually have to skin the dragons to get these or are they just drops?
I'm not a skinner but here is the list of mobs I know (not comprehensive by any means)
Green: Dragonkin in The Sunken Temple Instance
Black: Dragonkin in the Burning Steppes Dragonkin in UBRS
Blue: Dragonkin in Winterspring southwest of Everlook Dragonkin in Azhara by the lake to the south Dragonkin in the far northeast of the Hinterlands
Red: Dragonkin in the East of the Wetlands Dragonkin in UBRS
The Dragonkin range between 55 and 62 elites both casters and melee. The whelps of the same colour will normally be around their respective dragonkin areas but are very much less likely to drop scale when skinned.