For those currently reading this, it should be noted that now it is the hides which are quite exceedingly rare and the blood that is common. If I remember correctly, the hides are dropped only from the thul tae ew lizards, or whatever the brown ones are called (not the green ones). If anyone has seen them drop (again, the hides, not the blood) from a green lizard, please post here to that effect.
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Urnihixul Noctumbra
~Order of Seibwen/Ancient Fellowship/In Via Damnum/Alliance of Hope~ 108 Rogue
This is true---the blood vials are very common--in fact you can farm them from the 2 lizards that guard the door on the way---Be careful though these lizards tough---Lots of HP and the casters wil wipe you ---I have done this a full group Highest 65 Monk down to lvl 51 warrior--we did ok --a few deaths --We were after the vials and we were successful at so it was a good night