How much it should cost just to review the closing papers for a single family home?

Well, the annoying answer you probably have seen is that 'it depends.'  Unfortunately, it does, but if you are just looking for an attorney to review closing docs and give you a legal opinion, probably somewhere between $200-$500.  If you are talking about something more complicated like negotiating something, drafting, or actually doing the closing, you would be looking at higher costs.  Most attorneys will probably charge some type of flat fee for a review and assessment.