TTT Doesn't anyone have a source for these?!!!

All I could find was the Dahlia Imperialis at Dahlia Dandies, no signs of Campanulata anywhere though. There's been a seller on ebay that occasionally sells it, their username is strange_wonderful_things, but they aren't selling any items at the moment. Here's a handy site that should help you find almost any variety. They don't even have Dahlia Campanulata listed since none of the sellers listed carry it. It seems to be quite the rare find at the moment.

Here is a link that might be useful: The BigList: A North American Dahlia Variety Locator