Oli Price of Bonobo Book Covers  is a master of designing thriller, sci-fi, and fantasy book covers

Tugboat Design specialises in designing covers for women’s fiction, romance, and chick-lit.

99Designs is a platform with a large community of designers across disciplines including book cover & web design.

Bailey of Bailey Designs Books specializes in bright, bold and colorful illustrated book covers working across many genres.

Fiverr is a marketplace of freelancers across many different disciplines. It is renown for its affordability.