You're unlikely to find the good TG at any of the stores. The are about 6 or 7 places that get it in DSM and it usually goes pretty fast. They have been upping the numbers but they haven't been around the metro for a few weeks. Maybe if you're lucky they will deliver in the next week or so. You can always find TG Dorthy at one of these stores but it's just average IMO.
As far as Knoxville, they are talking about Peace Tree. They are an average brewery. Nothing special as far as IPA's. Decent place to go and drink if you're in Knoxville though. I just wouldn't take any home. My wife loves Blonde Fatale, which is pretty good if you like that type of beer.
I'm sure others will disagree with every thing I say.
If I was in the metro for the first time I would spend a whole day at El Bait Shop and forget everything else.