In my experience, Zingerman's is overpriced and overrated. That isn't to say bad by any means, it probably still makes the cut for "great", but honestly I had better experiences at Bread Basket for much cheaper (with the caveats that this was years ago, and I've every expectation it'll vary depending on what you're getting).
* cured, thin cut
* cured, thick cut
* smoked, with 3 or 4 types of wood
* uncured, thick and thin and smoked
* cured with lower sodium
* flavored with some kind of liquid smoke type stuff
* pre-cooked
also i've seen bacon clubs (like they do with wine) popup on the internet lately. so great.