All books have been professionally proofread so there is no need for changes. However, if you would like to make changes to the professionally proofread books we have a $50 content edit charge for 10 changes. Then, $5 for each change thereafter. The payment must be made before we begin making changes. 1 change is any word, punctuation, or paragraph removal. All other books are in the process of being professionally proofread. We allow spelling or grammatical errors to be changed at no cost.