I have an 8 pg. modified fin. agreement, parent plan, final judgement. Are there attorneys who will assist reviewing for small flat fee, not retainer?

Need assistance with reviewing a financial agreement (2 pages), a parenting plan (3 pages), and a final judgement modification (3 pages) for a flat rate before I sign it. I do not need further representation afterwards. My ex-husband is an attorney himself and he prepared the documents, so it would be beneficial to me to have an attorney look at these to see if there is any legal wording that is incorrect or misrepresenting on my behalf.