Buying Bugs Online

I do not intend this to be a cash-generating advertisement, but I am personally impressed by the bugs available for sale on this site. Most are really awesome! I am generally very skeptical about buying animals before seeing them but these ones are not very expensive (in the UK, as larvae or pupae) and none appear to be endangered species. Also, I don't think any can become invasive species in cooler climates such as the UK (where the site is based). If anybody has any information contrary to this please post a comment and I will remove this post.