UPS doesn't care what's in the box as long as it's legal to ship. They don't have a discounted "media-rate" like the post office does.


And as far as shipping goes, as I mentioned earlier: USPS priority rate averages out to be $2-3 a book there, and UPS is $2-3 a book back.
So all said ~$5 a book.

'Reading' / 'Reading soon' stack: DC/Vertigo - ArtOps, Batgirl, Gotham Academy, Gotham by Midnight, Injustice; Marvel - Allred's Silver Surfer; Other - Abe Sapien, Descender, Fight Club 2, Goon, Mind MGMT, Southern Bastards