Well, today I did a bunch of research and determined that I can print high-end adult quality coloring books in bulk for a very reasonable price that would allow me to sell them for $8-10 each for a good profit.
I also found I can get 24 color artists pencil kits for the books in bulk also for a good price and make a nice profit on those too.
I think these could go over very well at car shows and am already putting together 10 different 24 image books that can cover a wide range of cars and car types.
I have looked at all the other car coloring books for adults and they sell in the same range...and their images suck. Nowhere near the quality of the images I create.
I might just be onto something...