Actually, there has been a thread going on a few day ago here in the
eBay forum where the problem posed was the opposite, i.e. international buyers hit by customs duties when purchasing from the US. First of all, Ama, 80$ does not sound so terribly bad on a 300+$ purchase. In Italy, I pay c.a. 10/15% of import duties + 20% GST if the item is not declared as a gift. So as you can see, 80 bucks is not so out-of-the world. i understand that you might be pissed, but sometimes I wait my packages from the US for more than a month, and, in fact, parcels from the UK to Italy take up to two weeks. The seller does not have any control on the shipping after having sent the package, as there is no way of predicting if you are going to be hit by duties. That is only the buyer's problem. If the value is not declared lower and the parcel is not classified as a gift, there is a very high probability that you are going to pay import duties. Sometimes I pay duties *even* on packages that are declared gifts, because they might ask for the record of the online transaction to check the real value of the item.
I have heard that declaring an item as "used" might help, but I think it has some ripercussions on the liability of the postal insurance. I hope others confimr/deny this for me.
The point is: if the seller underdeclares the value, the parcel will not get stuck in customs and the buyer does not have to pay extra fees. And there are many sellers that do this as a routine. The problem is if the package gets lost or damaged, in that case the buyer can only claim back the declared value. if a seller does not want to do this, it is perfectly understandable, but you as a buyer will have to pay duties. that is how it goes with international transactions... but I still enjoy in making them!
Oh, I forgot to add that the faster the shipping method, the bigger the chances to get caught in customs: i had a drawer (!) shipped to me by sea mail from the US, fully insured for 200$. It took 4 months to arrive but no customs fees at all! (PS: in Italy the upper limit to receive things free of duties is 45 Euros, everything with a higher declared value gets hit by cistoms fees).