Speaking as a representatives for the bulk buyers (if I can presume), any order of 10 units or more should be shipped out USPS overnight. It's only 20 USD.
Arklan - Does this sound OK?
If OP wants to do a S&H discount on "bulk" orders, great, but I don't mind either way.
I'll be a bit chafed if there isn't a discount on shipping for "bulk" orders. ~$55 to ship 10 USB devices through USPS from UT to OR is exorbitant.