pluggin to provide “buy this print” functionality for Photo Blog?

Does anyone know of a good pluggin (or favorite 3rd party service) that allows me to have a “buy prints” or similar button next to my photos on my photo blog, so users can purchase prints of my photos?

I am interested in a service that plugs in nicely to PhotoQ, or recommendations on a 3rd party that offers good rates. The ones I have seen take a large cut.

Anybody using anything they are happy with?