So far, I have only sold prints at my exhibitions. Now, since I have received so many requests from abroad, I have made some selected pictures available as prints on Imagekind.com.
I really like Imagekind: The service allows you to pick the size, paper, canvas and frame of your print, the quality is really good, and they offer a 30-day money back guarantee. So far, I have used them for all my exhibitions and have never been disappointed.
PS: If you want exhibition quality, I recommend Hahnemühle Fine Art Pearl and Hahnemühle Photo Rag papers.