The list of drop sites looks like these can be found pretty easy in a variety of places, all of which are going to be no experience kills (except for the one raid mob). I went to Castle Mistmoore, and killed for maybe an hour and got over a stack of these. You don't need to be uber, but be prepared for lots of adds in Castle Mistmoore. Also the Gargoyles are spread out, with the max in anyone spot I am aware of is four. Usually it is one or two sitting in a corner of a bedroom, cubby hole, or other low visibility spot. And it is easy to get lost on the second floor. Make sure you have a map.
PS. How would you like a nice cuddly gargoyle sitting on your bedside table at night? I think Dark Elves have very bad taste. Besides this unappealling habit, they also associate with vampires. And in the Plane of Hate, they wear skulls as the cups for their bras and belt buckles. Ycch! But I digress.