I recently attended the MO State Genealogical Association annual meeting in Jefferson City, MO. One of the things they had there was a book sale of books discarded by the MidContinent Genealogy Library, and one of the LDS Libraries. Books over 100 pages were $5. Those under 100 pages were $2.00. I bought several on Maryland -- Maryland Marriages 1634-1777 by Barnes, Maryland Marriages 1778-1800 by Barnes -- and Settlers of Maryland 1679-1783 by Coldham.
I'm hoping to use them to add to our info on the Simpsons.