Where to buy Japanese rhinoceros beetle (Allomyrina dichotoma) in the UK?

Hi, I'm looking to find a site or breeder selling Japanese rhinoceros beetle (Allomyrina dichotoma) either grown beetles, larvae or dead. I would like to use them for use in the cultivation of Cordyceps Militaris as I have seen studies that this insect greatly increases the Cordycepin content of the mushroom.

Do any of you have any advice regarding obtaining these beetles in the UK? Seems that Google yields nothing, other than a few sites that are out of stock. I believe that this type of beetle will be worth a lot to cultivators of this type of mushroom.

Thanks!