Out of curiosity how come the only buyable trade aa's are New Tanaan Crafting Mastery and Jewel Craft Mastery? I don't remember any of these being expansion exclusive (I could be wrong). Seems like if you can buy JC mastery you could buy them all. Salvage would help too.
You can see what trade skill AA's are locked to what expansion by using the filters below. They were always expansion locked (mainly introduced in new expansions)
Alchemy and Poisonmaking Mastery were Luclin AAs. Jewelcrafting Mastery was originally an Enchanter only AA in Luclin. OoW released the first 3 ranks of the other 6 core tradeskill mastery lines and it pushed Jewelcrafting from Enchanter only to all classes.