You could try beermenus.com
I know some people that use that and it works well. I haven't used it much since it doesn't show much in Wichita, but you may have better luck.
I've found the best way to find beer is just call up your favorite or most reputable liquor store and ask if they have it. I've learned more about what beers are distributed when and where by doing that than I have on the Internet. Some aren't helpful at all, but if you get ahold of someone who enjoys or knows a lot about beer, they have some very helpful information.
seekabrew.com is also a good place to see what states distribute a particular brewery. It's not 100% accurate, but can be pretty helpful.