I have looked on forums, i havent found anything posting about this.
In zangarmarsh, there is a lake called "the lagoon" there are 2 islands that have lagoon walkers. These lagoon walkers have about a mote drop every 3-5 kills (they usually drop 2 motes when the motes do drop). The walkers are level 62-64 so they are easy to kill. My friend (warlock) glided here at like 65 to 66 or 67 and got 50 primal lifes and i think a couple blues. I havent seen anyone but me and my friends at this spots, so its probably safe to glide/bots.
EDIT: Primal Lifes usually sell form 15-20g on my server.