Yes. Via the Internet. Some sites, like fishpond.com, ship to the US. Other sites have digitalized the books. Some, such as the University of Nebraska-Omaha, have even made the books available for free. Source: about 2 years ago

My first stop is always bookfinder. Doesn't cross-reference every site but it does a good chunk of them. Source: 11 months ago

If an era (say civil war) go to http://bookfinder.com. Now on the front page click Advanced Search. You can select year of publication. So for civil war I would plug in up to 1900. Source: 12 months ago

First you need to learn to grade the book, as value is related directly to condition. Then you can look the book up on bookfinder.com and see what it's worth. But... there's a caveat. There's lots of "script sellers" out there, sellers that don't actually own the book - but which scrape the data, markup the price and offer it for sale, planning to buy it when you do. There's also many utter idiots who will... Source: 12 months ago

If you NEED to purchase a book, use bookfinder.com to find the cheapest books. Always verify the ISBN to make sure you get the correct one edition. Source: about 1 year ago

You should also check bookfinder.com. Source: about 1 year ago