It is a very rare day when someone actually sends me a digital photo, so I get all kinds of craptastic pictures with coffee stains, wrinkles, etc on em. Most of the photos I have to scan in and then fix up to remove issues, normally taking me about 10-15 minutes extra if it had just been digital. Some have asked me to make collages out of photos to put onto mugs or t-shirts, etc, which will usually warrant an extra graphic charge. I charge $15 for a single 11oz coffee mug, $19 for a 15oz.
If they're ordering bulk for a family reunion or something like that, then I give them my wholesale pricing sheet which is quite cheaper and has price breaks depending on quantities.