I'm currently levelling leatherworking, and instead of playing ridiculous prices for the mats, I've been farming them. Though I can't find any place to reliably farm Heavy Leather. I've looked through a lot of sites, and the majority of them say to farm Yeti's in Alterac Mountains, or Raptors in Dustwallow. Neither of these places are dropping much heavy leather at all, mostly thin and medium.
Thanks for any tips in advance!