The best cinnamon buns (in the world) come from Grounds for Coffee. But I can’t get them anymore because I moved out of Vancouver in 2008. (My brother mailed them to me for my birthday once, which was awesome)
The UBC cinnamon buns are pretty good, too. I ate a lot of them when I went there a million years ago. UBC posted the instructions here: http://food.ubc.ca/ubc-cinnamon-bun/