I just had 60 savage blood myself that I sold after running out of War Paints to craft trinket upgrades with.
They were all farmed legit using several level 3 barns.. actually I'm almost up to 20 blood again.
edit: You get like tons of blood since blizzard adjusted the drop chance of the level 3 barn. I was actually surprised people still bought those things for 1.5k a piece.