free 2700 - 3v3 - Arena Junkies
Level a toon to 70 make a 3s team with 2 friends, find another 3s team to wintrade with, level to 74 and profit. At 74 you will still be queued with 70s.
Yes this was posted in July, but given all the bugs in Mists I doubt devs had the time to "fix" this if there is anything to fix.
Note you will not be able to get T2 weapons once you lvl to 90, but the 2200,2400,2700 3s achievements will count for all your toons.