I would email the seller and tell him that you are unhappy with the postal charges(although...to be honest....I would have complained immediately after I found out in the initial invoice).Tell him that the profit should be in the item and NOT in the postage.Suggest that a partial refund would be a nice gesture and if he/she agrees then just let it go.If not....well...that is your option of course BUT...if that price was mentioned in the ad,then by rights,you should have asked right away.