Pricing will vary according to project details, budget, timeline, availability, and style fit. General price range:

Large “Big 5” Publishing Houses

$2,000– $3,500+ USD

Medium-Sized Publishers, University Presses

$1,200 – $2,000+ USD

Self-Published, Small Indie Press

$500 – $1,000+ USD

These rates are based on industry/freelance standards and what clients have previously offered me, see this article from INABC for more details.