We have eliminated the Build Your Own Boombox Fee! Shipping is a flat 6.99 for any number of packs and no other fees required for your packs to ship! If you add an add-on pack to a premade boombox an extra 6.99 will be added for shipping and your order will ship via Fedex 2-Day Express. If your shipping shows more than what it should be please let us know and we will get it corrected for you!