If you have almost a complete set sometimes it is worth the trouble to get the last book or two then sell them as a lot. I had some John D. MacDonald "Travis McGee" novels (I think there are 21) of my father's, and realized that with 19 I wouldn't get nearly what I would with the whole set. They sold for about $75 on eBay; incomplete it would probably have been in the range of about a buck a book. Look around on eBay and see if she sells. (I enjoyed the PBS dramas from her books, but I don't think I've read any. My Mom read them all).