well i dont think i saw a post of this before,
but some people dont seem to know how to level + save gold, they blow all their gold in twink crap just to reaplce it later.
So i tried this
kill anything in nagrand, they all drop Oshu'gun Crystal Powder Sample - Items - World of Warcraft and as you can also see there is a turn in, for the stuff, turn it in for this quest Oshu'gun Crystal Powder - Quests - World of Warcraft a lot of times and you make gold while getting a drop of exp, so by the time your 70 if you grind the whole time then you should have enough to pay for your flier and probably your epic flier, i was short 500g i think for my epic when i just purely grinded on my warlock those levels. the reason you have to start this at 64 is because the powders dont seem to drop for anyone below this, because if so... you could just have a level 1 /follow a 70 and the 70 go kills the talbuks and just turn it in but thats depressing they can't =(