Ever-tightening security procedures in the US have resulted in a lot of angst over airport rules, but they have consequences in other areas as well. Case in point? Sending most parcels to the US will now cost you $9 more as a "security surcharge", and may take up to two days longer.
The new rules apply to anything which weighs more than 453 grams, and any international Express Post items. It's not surprising given the recent parcel bomb attempts originating from Yemen, but worth bearing in mind if you're sending gifts (or auction goods) overseas.