Sorry it took me a bit to get back to you. Deviant Art won't send email notifications when someone PMs me. In the future, feel free to reach out to me at firstname.lastname@example.org
As for coloring, it depends on how much I have to do. To do a full comic page (ei. flats, shadows, highlights, and special effects), I charge $70/page. Just flats: $30. Just finishing: $40.
Send me a sample of what you want colored, and I could give you a more accurate quote.