Cheap used books from Colorado

I purposely did not go in any used bookstores while I was in the U.S. (though I admit I was tempted). Still, somehow I wound up returning from Denver to Singapore with these 21 used books. I bought them at two thrift stores where I went to buy pants. (Trousers? Whatever.)

These books cost me less than US$23.00 in total. (For the sake of comparison, note that the website of the most prominent bookstore in Singapore, Kinokuniya, lists new copies of the hardcover Four for the equivalent of about US$19.00.)

From a content standpoint, the book I’m most excited about is probably the psychology textbook. From a collecting standpoint, I’m most excited about Wolf Wing and the Percy Jackson books, because they match books I already own.