I have found a place that not only brews their own great beer but has an attached home-brew supply store... In Jan. They will also have an informal homebrew competition. I have never been in a competition so I will have to try this.
The place is called Dry Dock Brewing/The Brew Hut
There are many places in Denver but this one is close to home, so another plus.
I have only been a couple times to drink but get my supplies there often and must say I am happy with the service/advice I get.