These are the essential resources I’ve used to sell 70,000+ fiction books over the last six years without an agent or publisher. Current as of September 12, 2018.
NOTE: I only list services I’ve actually used.
Hire a cover designer who can execute the genre you’re looking for. Check out their portfolio for books similar to yours. When applicable, I’ve listed which genre(s) the cover designer is best known for. Note that some designers have long lead times, so contact them a couple months in advance of your project.
Listed price is for a complete cover (eBook and print-on-demand). Prices fluctuate due to exchange rates; they might also change. These are listed from most expensive to least; this is not a quality ranking. Custom illustrations run extra. These designers can also create things like Facebook banners, logos and so forth.
If you’re interested in creating your own covers, designer and author Jason Gurley has an excellent nine part free guide.
These lists usually devolve into useless 35 page appendixes. I’ll be frank: I read a lot of books. Most are not good. These are indispensable.