3D using your image or one of mine - $30 but not recommended as some publishers prefer flat 2D
Price can vary according to what extensive image modification you require – IE combining images or even shooting an image specifically for the book - or if you need something that requires hiring a model or specific attire/costume
My eBook is available for FREE on smashwords.com
https://www.smashwords.com/books/view/152051
http://www.amazon.com/dp/B00AZ9JQE2
Interior Images:
Basic price - $10 each with only trimming and sizing required. - can vary as noted for covers
Many different images available – insects, dragon, swords, guns, knives, trees, landscapes, deserts, ruins,- just ask - I may have it or can shoot it. - including special model poses / sessions tho model cost will be extra (they are costly) - remember I own thousands of photographs - a bit of most about everything, including ruins from Turkiye (Turkey) - via Photoshop I can do 'lots' of image modifications, just 'spell' out the changes and where to trim
NOTE : In many cases, if you are publishing a FREE eBook, not just a free sample, I may be willing to do your cover - free - simply for cover credits in the book