This turned into a Legalese thread fast enough. There's a lot of of misinformed beliefs when it comes to selling and buying, especially when shipping is involved. Most people are wrong, and some are right but for the wrong reasons. Buying and selling goods is provincially legislated.
For example, in Alberta, the Sale of Goods Act governs those transactions. Sections 27 states:
Duties of seller and buyer
27 It is the duty of the seller to deliver the goods and of the buyer to accept and pay for them in accordance with the terms of the contract of sale.
This is clear enough, but it doesn't stop there. Section 32 states:
Delivery to carrier
32(1) When in pursuance of a contract of sale the seller is authorized or required to send the goods to the buyer, delivery of the goods to the carrier, whether named by the buyer or not, for the purpose of transmission to the buyer is, in the absence of evidence to the contrary, delivery of the goods to the buyer.
(2) Unless otherwise authorized by the buyer, the seller shall make a contract with the carrier on behalf of the buyer that is reasonable, having regard to the nature of the goods and the other circumstances of the case, and if the seller omits to do so and the goods are lost or damaged in course of transit, the buyer may decline to treat the delivery to the carrier as a delivery to the buyer or may hold the seller responsible in damages.
(3) Unless otherwise agreed, when goods are sent by the seller to the buyer in a route involving sea transit under circumstances in which it is usual to insure, the seller shall give such notice to the buyer as will enable the buyer to insure them during their sea transit and if the seller fails to do so, the goods shall be deemed to be at the seller’s risk during the sea transit.
This is the relevant part. If shipping is agreed upon as part of the sale, the seller is deemed to have delivered the goods when he leaves them with the carrier. The seller is required to make a contract with the carrier on the buyer's behalf. If the buyer declines insurance, then the buyer is responsible for the loss. If the buyer requests insurance and the seller doesn't get it, the seller will be responsible for the loss. Part 3 is for sea shipping only, something we don't usually deal with here on CGN.
This act will be different for each Province but I suspect that if everyone did their research they would find similar conditions.