I am trying to purchase some "KUMAGRA" apart from ebay where can i get some?

I am trying to purchase some kumagra apart from ebay, where can i get some. I had some of this when i visited brighton last year and it was really good as good as viagra but 100% herbal so no concerns with side effects as with viagra. As i am up in London for a month i am to far away from brighton, as i need them for a night that has been booked for tuesday. does anyone know any shop up here that sells it? I've tried soho but no joy. Any help will be much appreciated, thanks.