I also offer a typography service, for those authors who have a favorite illustration artist and just need the typography to turn the artwork into a finished book cover.
Since the amount of work required depends somewhat on the image and whether the artist has left enough space for the typography, there isn't a one price fits all cases...
In general, provided there's enough space for the typography, or if something needs adjusting and you can supply me with the PSD, or put me in contact with the artist, then the price is $60. However, in the rare cases where I have to extend the artwork because it's not the right size for what you want, or there's no space for any typography, then the price is going to be dependent on the amount of work. Please message me with your specific request - if it is one of the rare cases, I will explain why.
See my Typography On Artwork Portfolio for full details.