Amazon has taken easy shopping to new heights (unfortunately :wink: ).
I always use the .ca site for Canadian shoppers.
I've bought things from secondary sellers as well through Amazon, such as secondhand books, and have always been pleased with the service.
Shipments from Amazon come with a postage-paid tag if you want to return them, you don't even pay the postage! They obviously do huge business to absorb so much shipping cost. Even if you order items that come from several places, in multiple shipments, there is only one shipping cost and sometimes that's free!
Another nice thing about Amazon is the product reviews. People like us write reviews on things, which becomes a handy shopping tool when making a decision about what to buy.