With more and more micro breweries popping up, beer is getting better and more available.
There are a few bars were they will stare at you strangely if you ask for a brand that is more commonly sold by the case at a discount price. I'm not sure that they even stock those 'American' beers.
I have come across and had recommended some outstanding beer over the last decade that are locally brewed.
The major breweries try to make similar beer, they just don't have the right brew masters, I guess.
Ativan