For those seeking an affordable quantum physics textbook at an intermediate level, Griffiths is highly recommended for its readability. To save costs, consider purchasing second-hand paperbacks from online stores or consulting with a librarian about acquisitions. In extreme cases, contacting the author for permission to download a version may be an option. International editions, often cheaper and printed in black and white, are also worth exploring. Amazon is a viable option for purchasing, but Alibris is suggested for finding used textbooks at significantly lower prices. Additionally, Park's quantum mechanics book is noted for its affordability, and the Dover reissue has contributed to lower prices for used hardcovers.