The beetles that you all are referring to are called dermestid beetles. They can be ordered through some taxidermy supply companys and they live on nothing but dried meat, skin, and each other. They need to be kept at or above room temperature year round, and require a certian amount of space per beetle.
Like Lance mentioned they are rather expensive to house and maintain, therefore skulls prepared with this method can be pricey.
We use to have our own tank full here at the tannery, but they breed like rats, tank was never large enough, they defecate twice what they eat and they are about the worst thing you want on the loose around here with all the hides coming and going. A spoon full of these critters could clean out and ruin a 12x12 room full of hides in less then a weeks time.
We (you all included) actually have our own version of the dermestid beetle living in our back yards. It's a domesticated version. Anyone that's ever had put up fur hanging somewhere and found the floor around the furs littered with hair and dried up insect skins knows what I'm talking about.
Keep it away from your put up hides, throw it in the back yard and let em at it...or soak it and you'll be better off /ubbthreads/images/graemlins/wink.gif