AS far as I know, there isn't, and they would be illegal if there were and your account will most likely be banned from the World of Warcraft.
I used power leveling service, it is safe for account. I always purchase from http://www.guy4game.com/?aid=775. A rock site.
This has been checked by Blizzard that cheats will not be tolerated and they will ban anyone caught doing so. Stated in a Newsletter.