Noticed on my cc statement this morning that Amazon.ca automatically billed me for prime membership - $80-something. Not sure of all the perks but faster shipping seems the only obvious one.
Didn't recall signing up or telling them I wanted membership but it was a free option previously. Seems maybe now they mass billed people if you've ever used it.
Anyways, worthwhile checking if they billed you automatically. It's super easy to cancel and stop the auto-renewal. A full refund is expected in the next couple days.