I have some surplus belt leftover from my belt driven CNC I made some time ago. Don't have too much pictures, in fact non, I think - they disappear in stomach of our samoyed puppy together with 2GB memory card.
3M 15mm wide and 5M 25mm wide-
ebay auction no 300608706166 and 300615411815
Pulleys and belts I buy from bearing boys good price, selection and fast delivery