I have never bought creepers online myself so I can’t really answer on that, I am sorry.
But for online stores, please check the links on this post. :)
You can submit a picture or just tell me where on your tumblr I will find the picture, since tumblr doesn’t allow to send links. :)
No sorry, I have no idea about other places than maybe london an berlin. But you should check gothic/cyber fashion based shops. :)
thanks, will do ! <3