I see Amazon Canada is starting to expand their automotive offerings. Their prices on synthetics (including very prominently features RP) are fair. They're not going to clobber a Walmart rollback, but they are better than a Walmart regular price, and there's nothing wrong with that. Their conventional prices could use some work, though.
They do need to reorganize a bit. There are way too many items in their very inclusive "oil" section, including waterproof grease, Lucas stuff, brake fluid, and so forth. The American Amazon site is much more easy to navigate.