Check out antique stores along with gift shops of local museums/historic societies - they almost always have old recipe books. I have an old 19th-century Shaker cookbook which is fun. I also have a copy of “Early American Cookery” by Sarah Josepha Hale. Lastly, I have a copy of “What Salem Dames Cooked” which is an old New England cookbook. All of these I got at antique stores or gift shops for museums/historical societies.