Originally Posted by
Neji
I'd advise against buying it - the very idea cheapens the accomplishment and its pretty easy to tell who bought their runs if they hit the leader board for their server at all. Just takes time and some effort. I highly recommend watching the Hamlet videos (found on wowhead under the challenge mode guides) and go stock up on invisibility potions. From there find like minded people. You don't need 9/9 from all 4 other players to get it done - just a will to progress and a desire to overcome the challenge.
I went with 3 buddies of mine and a friend of a friend usually filled the 5th spot. Our comp was monk (wind/brew), resto druid, ret paladin, frost mage and myself (guardian/feral) so don't let anyone tell you any specific comp won't work. Some might take a little bit more work (like mine with double melee) but in the end it boils down to having smart players.
Also, some advice most people don't give. Go in on regular or heroic and do a dry run. Map out where you want cool downs, where pulls will be made, which packs are getting pulled, etc. This is a huge help before you go in and just start going ham-fist.