I'm going to go pick my MP5 up from the post office today, but the slip I got in my mailbox saying when to pick it up had a unfortunate surprise on it...Customs fees. I have to pay $23.35 to Customs. I appreciate all that Customs does for us, but I'm not sure what I am paying for (isn't the customs fee included in the original shipping cost?) Has anybody else had this happen to them?