* Prices vary: Book prices change depending on where you buy them (bookstore, online, etc.), the specific edition (hardcover, paperback), and any sales or promotions.
* You didn't specify the edition: Are you looking for the original paperbacks, hardcover versions, or something else?
To get a good idea of the cost, I recommend:
1. Check online retailers: Websites like Amazon, Barnes & Noble, or your local bookstore's website will have prices listed for the books.
2. Visit a bookstore: If you're able to visit a local bookstore, you can see the prices firsthand and compare different editions.
I hope this helps you find the books!