Domestic (USA) shipping options for strings and non-book items: When you place an order for just printed matter or CDs, your merchandise is within the "media mail" category and shipping is very reasonable for any weight over 13 ounces up to multiple pounds. Anything that is not a book or CD is eligible only for first class or priority mail. If you are ordering multiple books and then you add one string, your package is ineligible for media mail and may be kicked into a higher range. To keep shipping more reasonable in some cases, you might consider placing two orders, one with just books (media mail), and one with non-books. The 13 ounce rule: If your order of combined media and non-media items doesn't go over 13 ounces it can be shipped first class USPS which averages around $4.00. If you notice your shipping has gone up significantly, it is likely because your combined book and non-book items have gone over 13 ounces. If you have questions on this, please give us a call at 281-890-4500.