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The one that is difficult to account for is it is often cheaper to buy and have posted something from China than it would cost to post the same item in the UK .Jo
You may insist for having postal service for deliveries, as fees are limited to postage and the import taxes.
My rivets came today they cost $35 US for 1000 1/16x 5/16 That seemed OK but then the shipping was $34.65 US because they ship via UPS the big shock was the additional $35 Canadian for The UPS Brokerage fee and GST So My 1000 rivets worked out at $91.94 +$35 for a total of $126 Canadian which comes to 12.6cents apiece which seems a bit outrageous. Mike