When I read this, I was curious how possible it would be, if there's sufficient supply in the market... I found this vendor page. So, there would probably be enough supply as there are taxidermists who need to clean big game skulls, which require thousands of larva and adults, and the vendor say you should email them if you need more than 10'000. I couldn't learn how much time it would take, but they do say that more = faster, and to communicate with them to fit your project timeline.