The 31,97 is for express service, check the prices at CTT for international shipping, with the same features (insurance, tracking, etc) and it shouldn't much different.
Don't blame SmashTV for the prices charged by USPS.
I just ordered 2xLPC17 PCBs from MidiBox Shop to Portugal, low value parcel.
Portugal is not listed in the countries menu so you will have to contact him, you should have done that before posting this.