My editors at one of my e-pubs, Kate Richards and Valerie Mann, have created an editing service called Wizards in Publishing. I can say honestly that they have made me a much better writer. And I'm so tickled they are offering this service now. They also format and upload if you need help that way.
I also have experience with The Authors Red Room. Literally, for the price I paid, 2 separate editors went over my work, and I was very pleased with the result. They had my ms turned around within just a few days.
Here are a few more:
Bev Harrison- firstname.lastname@example.org 1 cent per word with $75.00 minimum fee. Although she runs specials.
Cathy Donaldson www.cathydonaldson.net -edits
Bev Rosenbaum www.bevkatzrosenbaum.com does critiques
Eliza Knight http://elizaknight.com/
Wendy Ely- http://creativemanuscripts.blogspot.com/ also a multi-pubbed author.
Caro Carson www.carocarson.com/ The Midnight Line editor Has edited for Catherin Kean, Kresley Cole, Susan Grant
Blair Bancroft- email@example.com
New as of 03-25-12
Found these on Women’s Lit Café: http://www.worldliterarycafe.com/forum/24 Huge list of editors.
http://www.kristenweber.com/faq.html - on the expensive side, but Big 6 experience.
This is not a comprehensive list, of course. These are just names that I've run across or heard people using. Be sure to investigate any service provider as thoroughly as you can.
If you have a suggestion, please please leave a comment with your recommendation.