Thanks to everyone who chimed in here. I found an old 1994 copy of "Photographer's Market", where it seemed that the ballpark figure bandied about in the book was in the neighborhood of $100-$150. I took inflation into account and proposed $200 per photo, but I haven't heard back from the guy, so maybe that was too much. Or maybe he was just fishing for prices and wasn't really interested in buying. -dan c.