I found them! I found the “thinking of you” for no reason/”miss you” section. They were in Walmart, where I had looked previously with no luck.
They didn’t have the best selection so I didn’t end up getting any but at least they do exist! I was starting to think that I made them up. Canada does seem to have a pretty good selection of birthday cards and Valentine’s day cards though so I will keep that in mind for upcoming events.