Beastman Blood in Pashhow Marshlands
Out in Pashhow Marshlands is a great place to farm Beastman Blood. You'll usually get 25k a stack on the AH for this making it great for anyone leveling up to stop by and farm some. You'll find the most Leeches by the water in Pashhow. When running back and forth between swamps kill the Crawlers and Goobues for Cuttings and Silk as well.