Founders you'll find all over. And Bell's. But you specifically named a truly hard to find Bell's. Black Note is one of the
holy grail beers people look for so you won't find it on at a bar by chance unless you feel like buying a lottery ticket. They don't announce a release schedule for it, so it just kind of shows up at places and then beer watchers post about it on the internet. No sightings reported on Beer Advocate this year that I know of, but I haven't followed as closely as the past.
Here's the Bell's regular beer schedule for those visiting Michigan and want the BEST BEER IN THE WORLD. Yeah, I went there. World title claimed.
Right now is Hopslam season and I couldn't be happier. Everybody needs to try it if you enjoy, well, hops.