I just got one yesterday that I ordered for $42 at skeleton factory. For the price, I do believe it can't be beat. There is no spring on the jaw, and it pretty much stays open, but can be forced closed. I assume a small plate or sumthin screwed to the jaw and head would hold it shut.
I plan to buy at least one more, and rig them up in the cemetery. One digging, and another holding a rusty lantern. If I get more, then more diggers, and maybe a lazy one watchin em work.
Here are pix of mine...