Did a quick search but came up severely lacking. Maybe if you have a local B&M that has a sales rep for Swedish Match, the owner of Borkum Riff, you'll have more luck, but Swedish Match doesn't list Borkum Riff cigars on its Web site. Wish I had a better answer for you.
My local B&M carries them.. I used to get them, until Christmas time.. I got a pack of the peach ones, and they were full of tobacco mites.. Took them back and returned them, and have not been able to make myself get anymore since that time..