If you let me review your document, perhaps I may agree this is is a "quickie", and lower my requested compensation.
You are not getting any inexpensive bids because the bidders have no clue as to the current quality of the document. Whether it is in good condition or not, any reputable proofreader will have to read EVERY sentence, and may very well have his or her own take on good grammar.
I have edited and proofread novels, websites, self-help books, CVs, Masters' Theses, Doctoral Dissertations, Letters of Application to universities and medical schools, worldwide. I can be of assistance. It is as important to me as it is to you, sincerely.
Please read my profile, and my reviews, all unsolicited. I have a great depth of experience with this area of endeavor. I can do a small section of your work, gratis, prior to award, to allow you the opportunity to review my qualifications.
I appreciate any consideration of my interest.
I am in the Eastern US Time Zone.
Please let me help you.