Sometimes collectors need to settle for a facsimile or reprint of a book, especially when the original is costly or hard to find. History and genealogy researchers are often quite satisfied with these substitutes.
One good source of reprints is Heritage Books, 65 East Main St., Westminster MD 21157-5026. They list about 12,500 reprinted books from many publishers of all states including Delaware. Several thousand were reprinted by Heritage. They were, for instance, the publishers of the latest reissue of Scharf's 1888 History of Delaware. It is now out of print and auction prices are approaching those of the original because it has a far superior index.
Heritage books and its subsidiary Willow Bend Books issue regular catalogs. However, you can see their stock at www.heritagebooks.com.