Hi when i was lvl 70 and didnt got money for flying mount i used this grinding spot:
Youll need to grind primals (primal air) you can get those in shadowmoon valley.
you can find the mob that drops mote of air here:
Enraged Air Spirit
http://wowhead.com/?npc=21060
He also drops Essence of air
Primal air: Primal Air - Items - World of Warcraft
Mote of air: Mote of Air - Items - World of Warcraft
Essence of air: Essence of Air - Items - World of Warcraft
Primal Air sells for 40G on my server (for 1) i think its random from server to server.