Also be aware of size limits with Shopmate, I tried to send a rust repair section that came in a box that turned out to be larger than their max allowed. Only options were to pay for return shipping to the supplier and hope they would accept the return or pay Shopmate to dispose of the item. Not a good ending.
Shopmate will also collect the GST for items and charge you for that before posting. Not an issue for eBay etc who already collect the GST but for private shipping from independent sellers this takes away any hope of getting away without paying the GST.
Roger