where did you get such good armor? Did you find it or buy it somewhere. I have a crap load of cash but never come across store owners that actually sell good stuff.

Most of it I picked up in treasure chests or drops off of creatures.  You may want to try Booty Bay.  (When you can finally get there)  Also in duskwood there are a lot of treasure chests which help out.  But that would be best for characters lvl 35-40.  For you In Tanaris just west of Gadgetzan there is the Winterspring field.  Now this area has FIVE treasure chests in close proximity.  There is a repeatable mission to this area from Gadgetzan as well.  So, you do the quest but also make the rounds on the treasure chests.  Hope that helps some.

Another aspect of the game which can affect traders wares is reputation.  If you have exaulted rep with a city then the venders will sell things to you not available at friendly, honoured or revered.  But it takes a long time to get that kind of rep. And unlike honour it doesn't decay.