Hi, if you've edited your work as much as you can and friends have given you all the information they are capable of, you can look at being professionally edited. The costs vary and the quality of editing varies as well.
I've had my work edited through The Story Mint and find them to be of very high quality:
" Appraisals and professional feedback on your writing
If you would like a proven professional writer to do an appraisal of your novel or short story our rates are below:
Scripts up to 5,000 words - $100US
Scripts up to 10,000 words - $175US
Scripts up to 10,000 words - $175US
Scripts up to 25,000 words $375US
Scripts up 85,000 words - $600US
Scripts up 85,000 words - $600US
Our next monthly newsletter will feature one of our assessors.
Please Note: This service is for members only.
Contact The Story Mint for more information "
I suggest, however, you also take a look at the book mentioned below via the link and edit yourselfusing it as a excellent guide. I've read it four times and it is one of the best books around on editing. Reading it and putting it into practice will reduce your editing costs in the long run:
The author, Renni Browne, also has an editing service. But since I have never used it I can not vouch for it, but take a look anyway and decide for yourself:
Hope all this information helps all you writers out there!
Mat Clarke