Domtar is a paper company, and they put out some excellent booklets and samples (a.k.a. junk mail) in their efforts to get me to use their paper. (Or influence my printer to start using it.)
I’m pretty sure I ended up on these guys’ database through my subscription to Print a few years ago, and they are only company ever who’s junk mail — the kind that gets hand delivered to your house by a mail man — I actually want to get.
If you get inspired by stellar design printed on rich, heavy paper that gets delivered to you for free, you may want to sign up for some free samples, too.